Why the is-ought gap is not a big deal To remind folk of the key issue as I see it, ethics is generally a topic unmoored because it can't place itself in the world in general fashion. It winds up in transcendental modes of thought where either the conscious self is the solipsistic author of all value, or some appeal has to be made to the dualistic or supernatural, such as determining gods or Platonic ideals.
So I offer the natural philosophy alternative where the Cosmos is granted all four Aristotelian causes. Existence is organic, not mechanical. The Universe in a sense has a mind and a purpose in that it is organised by "reasonable" principles and has generalised habits or tendencies.
This organic view seems hard to swallow because the mechanical view of nature is so technologically triumphant. That in turn leaves notions of the mental or spiritual aspects of life no place to exist except "outside the world". But just because western intellectual culture has driven its articulated truck and got jammed up that particular cul-de-sac doesn't mean that organicism hasn't being off doing its own philosophical thing all the while. Organicism thrives inside science in fact.
Anyway, the point is to grant formal and final cause to cosmological being in a way that is sensible and scientific, not mystical or handwaving. And semiotics is about relations of evaluation or interpreting that start as spontaneous and hesitant suggestions, but which by positive feedback become established as robust habits that have formed their own "umwelt" or world of sign.
So a feeling of good or bad - approach or avoidance, reward or pain - are examples of biological level symbols. They are not perceptions of anything actually noumenal. Just like seeing red or green, they are acts of judgement. When we point to them, we are pointing to signs we have constructed as a reliable and pragmatic way of mediating our interactions with the world.
That is why it is ridiculous to point to feelings as metaphysically primary. They are merely ciphers that stand for an interpretation at the end of the day.
Of course they are ciphers with maximum meaning attached. They really matter to us. Yet still, they are the products of habit and thus emergent and developmental - meaningful to the degree they reliably reduce any requirement for actual further thought or inquiry. That is why "feelings" are fundamentally irrational or anti-philosophic. The Romantic waves them about to put a stop to any unpicking of his or her umwelt. The contextual subjectivity of the sign is treated as an objective fact of being. And when questioned about where this being exists, the Romantic has to give an anti-materialist response as justification. Feelings are have substantial being because they reside in some place called "the Mind", or "Platonia", or "the Spirit".
A cosmological naturalism based on a general four causes realism and the specific mechanics of semiosis (as the way to bridge the gap between "mind and world", or rather top down constraints and bottom up freedoms) instead sets things up as a hierarchy of being. There is a cosmological gradient from the simple to the complex, the entropic to the negentropic, the general to the particular, the necessary to the contingent, etc, etc.
So then from the point of view of the moralising human, we can look out across this orderly hierarchy of concerns and place ourselves within it. We do that intuitively already. We can decide not to eat cows on the grounds they are sentient, but eating cabbages is OK because ... we don't regard themselves as sufficiently sentient just because they can turn themselves to the light or communicate with their peers about pest invasions through chemical signals, or whatever.
Hah. Already I am returning to the point of how unmoored from scientific measurement most moral thinking is in fact. We still do want to apply all or nothing judgements on issues like sentience even when there is a gradient that more careful world modelling would reveal.
Anyway. The point is that naturalism puts mind and meaning back into the material world in a metaphysically rigorous fashion. It models it in a orderly and counterfactual fashion which is what makes it scientific and measurable.
Of course as an intellectual project, this "pan-semiosis" is not yet completed. However if it were a done deal, safely finished, I personally could hardly find it so interesting. The fun is seeing what is happening at the edge of human thought right now.