Panpsychism is true in the vague sense that consciousness can be constructed from common elements, but the metaphysics is bullshit. Its credence relies on materialism's apparent inscrutability. Nothing more. That it's taken seriously seems absurd at this point; progress in computational modelling (Joscha Bach, Anil Seth, etc.) is answering the Hard Problem incrementally. Chalmers, gifted as he is, hasn't been helpful.
Within a materialist paradigm, yes, consciousness exists on a spectrum, but it may be more complicated than it sounds. Consider the case of Washoe, the chimpanzee taught basic sign language: https://en.m.wikipedia.org/wiki/Washoe_(chimpanzee)
Researchers were unable to teach her beyond the level of a pre-schooler, and found she had a genetic learning limitation. The human brain therefore evolved past a cognitive tipping point, which, according to David Deutsch, affords us access to infinite knowledge of concepts, connections. An evolutionary event of some kind triggered the human brain to develop into a different kind of brain altogether. So though humans are objectively speaking more conscious than chimps, measuring beyond the tipping point becomes more subjective.
Accepting the above, it's still tempting to overthink conscious experience into mysticism. But it's probably more rationally intuitive. Human & animal rights have become more empathetic precisely because advances in global communication networks and an increasing number of interconnections with morality principles raised social consciousness as such. The same goes at the individual level, with a major step perhaps being the advent of writing, which allowed concepts to be broadly disseminated. Under this view, consciousness is simply the acute awareness of observable patterns that constitute reality: the more patterns one is able to be aware of simultaneously, the more conscious-feeling they'll probably be.
A supporting--more basic--observation can be found between differing lifestyle orientations. It's been argued that submission to social norms narrows the lateral scope of an individual's conscious awareness over time, that the more embedded in a given living routine one becomes, the less conscious of the world writ large they'll be; and that skepticism and non-acceptance and friction with social constructs promotes greater awareness of reality in general--baring in mind that awareness + attention are synonymous with consciousness, which in a materialist worldview they usually are. Thomas Pynchon had a cool way of framing it:
“Temporal bandwidth, is the width of your present, your now. It is the familiar “∆ t” considered as a dependent variable. The more you dwell in the past and in the future, the thicker your bandwidth, the more solid your persona. But the narrower your sense of Now, the more tenuous you are."
– from Gravity’s Rainbow
Genetically, though, we're only optimised for a limited, socially-margined faculty to develop. One person can be more conscious than the next, but that same person may find themselves more disadvantaged the more conscious they become, especially without the requisite reasoning and decision-making capacity. Basically, the more conscious you are, the more effortful reality is to navigate through.
This is consistent with a common experience of psychoactive drugs: removed from habitual thought processes, conceptualisations are frequently novel in their comparative uniqueness, which sense of uniqueness is proportionate to how far removed from an embedded perspective they are. Hence the phrase "consciousness expanding" -- the extending of an awareness bubble encouraged by psychadelic ventures to the outside. (Fortunately meditation and other healthier practices have similar effect.)
Intelligence and consciousness are interrelated, too; natural fluid intelligence (taking abstraction capacity and creativity into account) reflects a genetic baseline, the extent to which one is able to incorporate new concepts into a functional model. An ability to learn more than average without becoming overwhelmed, affords greater consciousness expansion.
Meaning, it's very possible for a being/AI to be more conscious than any human can be. It would simply need to be simultaneously aware of more moment-relevant concepts than we're capable of.
That the 'feeling' of consciousness is strong enough to infer something inscrutable going on is not a rational argument. Conscious experience is just whatever your attention (and peripheral attention) is focused on, inclusive of thought. If someone or something can be consciously aware of more stuff than us, with wider-reaching well-functioning algorithms, it follows that more evolved organisms can be more conscious than we are.
Side-note: the language faculty has something to do with it. How conscious was Genie, would you say? Was she as conscious as we are? How would it seem jumping into her consciousness and back again?
https://www.theguardian.com/society/2016/jul/14/genie-feral-child-los-angeles-researchers
^ the differential between language-developed persons and Genie, is perhaps where the crux of the debate rests; i.e. if from the inside of her mind the world appears and feels less vivid, it follows consciousness isn't constant; that it's variable, and evolving, and there's probably superorganisms out there way better at multitasking than us.