This is an interesting, well framed post. But I find myself disagreeing with most of it, so I'll just throw out why.
Philosophical inquiry, try as it may to find some sort of light, has led us deeper and deeper into the questions. At this point in history, we now must immediately be suspicious of ourselves if we ever claim some answer has been made clear - this could give rise to the much maligned "objectivity" or worse, the terror of "dogma".
I would consider what the fear of error presupposes itself.
Meanwhile, if the fear of falling into error introduces an element of distrust into science, which without any scruples of that sort goes to work and actually does know, it is not easy to understand why, conversely, a distrust should not be placed in this very distrust, and why we should not take care lest the fear of error is not just the initial error. As a matter of fact, this fear presupposes something, indeed a great deal, as truth, and supports its scruples and consequences on what should itself be examined beforehand to see whether it is truth. It starts with ideas of knowledge as an instrument, and as a medium; and presupposes a distinction of ourselves from this knowledge. More especially it takes for granted that the Absolute stands on one side, and that knowledge on the other side, by itself and cut off from the Absolute, is still something real; in other words, that knowledge, which, by being outside the Absolute, is certainly also outside truth, is nevertheless true — a position which, while calling itself fear of error, makes itself known rather as fear of the truth.
G.W.F Hegel - The Phenomenology of Spirit §74
If we try to say what identity is, we are stuck battling between some sort of platonic fairy essence, or universal natural kind fairy, and
I am sympathetic to your point here as a big fan of process physics, but I think conceiving of the Platonist's universal as a sort of magical "fairy essence," is a little off the mark. Plato is nondualist in a key respect, in the sense that Shankara, Miester Eckhart, or Plotinus deny real ontic division. Plato and later Platonists like Porphry, Plotinus, and Proclus (P⁴ as I call em) rather embrace an idea of veridical hierarchy where what is "more real" is more real in virtue of being less contingent, less a bundle of external causes, and thus more fully itself and self-determining.
I only point this out because I long dismissed Plato as positing some sort of "spirit realm," of forms as distinct from the world we live in, and only later realized this is a cheapening of what Plato has to offer. It might be better to think of Plato as a sort of objective idealist rather than any sort of a dualist, and his conception of the universal flows from his idealism and anthropology.
Aristotlean essence would likewise not be a "fairy essence." Essence is a facet of nature related to form. For Aristotle, secondary substance is discovered through experience and the process of abstraction (and thought is definitively processual in Aristotle). I don't think this conception of essence is necessarily at odds with "the motions of physics that constantly redefine particular things and deny identity a chance to take hold, ever." Aristotlean essence can be cashed out in information theoretic/pancomputationalist conceptions of physics (which are essentially processual), where the form is just the informational ensemble corresponding to morphisms between "types" abstracted in consciousness. The question of whether such forms truly "exist" would be related to the question of "do numbers exist?" But for Aristotle, forms, number, shape, etc. exist exactly where instantiated in the natural world, so there doesn't seem to be much "fairy" or supernatural about them. Granted, there are also many ways to formulated essence is ways that do clash with physics.
If we try to point out a thing in itself, we can show that we are pointing in the wrong direction, pointing always instead at the phenomenon of our own devise, never at the thing that is the only thing we were seeking.
Doesn't this assertion clash with the above assertion re skepticism and dogma? Certainly many thinkers have challenged Kant's formulation of "phenomenal vs thing-in-itself." The biggest charge against this is precisely that it results from Kant's own dogmatic presuppositions. Aside from that, per Berkeley, Kant is just simply wrong and confused here, positing things he has no reason for positing. Point being, this assertion re the limits of knowledge is itself grounded in its own metaphysical assertion.
If we try to point at our own minds, being the Pointer, as if mental constructs were things in themselves, we spin off into an impossible picture of a self-reflective object that never grasps any object at all, and that is a now immaterial "self", or we spin off into mind/body dualism that is irreconcilable, incapable of physical unity. And we have to invent ghosts or spirit or ego as placeholders without any better grounding than the fairy Platonic forms. More Deus ex Machina to move the plot along.
This seems to be a real problem. This is why a number of thinkers (e.g. Jensen) say the way to avoid "being trapped in the box" of ideas or language, etc. is to simply never get inside the box to begin with. What is required is a paradigm shift. That is, getting trapped in the box is evidence of bad starting suppositions. As Aristotle says in the Nicomachean Ethics, "sometimes we need to start at the end, with what is most familiar to us." Much of modern philosophy is the denial of this, the assertion of foundationalism and the need to start from the beginning, with what is least familiar to us. It's problems might simply suggest a flaw in methodology.
If we are amazed that my words here have allowed you to read this far in the post, we should be amazed, because the meaning of words is like identity, or essence, or self - a placeholder so that we might use these words at all, and the pursuit of "objective meaning" is a useless pursuit because meaning is more like use in the first place, and "meaning" has no real use anymore. As usual, putting aside what my words here might possibly mean, words themselves do not seem sturdy enough to move us out of the gate. And now I remind myself that all wisdom can only be recorded in words, so even if I found wisdom, why would I think I could communicate it in words?
Should we be amazed? It seems prima facie unreasonable to say words don't mean anything. To quote J.S. Mill, "one must have made some significant advances in philosophy to believe such a thing."
If language is ONLY use in games, what game are we playing with ourselves when we engage in internal monologue? What game are mammals playing when we can almost universally recognize aggression or fear in each other based on facial expressions? It seems to me like a full accounting of language requires that the idea of a "game" and "use" be stretched to the point where they no longer reflect their original content. In PI, Wittgenstein warns against such all encompassing theorizing and reduction. But considering all of PI grows out of a Saint Augustine quote, I find myself wishing Wittgenstein had engaged a bit with the semiotic theory of that author, because I think it would clear a lot up.
The problem might lie in the search for "objective meaning," itself. Words cannot mean things "of themselves." We have a fundementally broken paradigm if we must assert such a thing. But much hay has been made over showing how the positivist paradigm (objectivity approaches truth at the limit) is wrong, and then turning around to claim that this means we must dispense with "meaning" and "truth" entirely. Rocks do not understand words by having them carved into them. Humans understand words.
From the outset with Saint Augustine, semiotics has involved a tripartite model of object known/sign by which it is known/ interpretant who knows. Philosophy of language early in the 20th century largely ignored this model to its own peril. Thus we end up with a formulation where the sign represents an insurmountable barrier between object and interpretant, rather than the very means by which the two are linked, a strange formulation.
And then there is freedom, that base existential condition that is what it is to be a human being, in a world so over-crowded with necessity and determined forces that there can be no room for freedom. Of course the logic that demands we see freedom is impossible, is the same logic that showed us logic itself may be built of the illogical.
Only if we assume that determinism and freedom are mutually exclusive. But consider that uncaused randomness also precludes freedom. For our actions to be our own, they must be
determined by our memories, desires, beliefs, etc. I think Leibniz makes a very solid case that determinism is a
prerequisite for freedom, not anathema too it. Determinism is only a problem for libertarian formulations of free will as "uncaused." I think these are ultimately contradictory. If something is uncaused, determined by nothing, then it is random and arbitrary. Random action isn't free will, although it also isn't determinist.
The other main objections to compatibalist free will tend to be grounded in reductionism and smallism and I find the empirical evidence for these claims to be weak at best. That is, "atoms don't have meaning and purpose and all facts about humans are reducible to facts about atoms, so reason and purpose must be illusory," is not a claim I think is particularly well supported by the sciences. Actual reductions (not the unifications they are often confused for) have been very rare in the sciences and mature fields like chemistry or physics itself have yet to be reduced. Is a century long enough to declare that reductionism shouldn't be the default assumption?