The most fundamental argument for panpsychism is that it obeys Occam's razor FAR better than the "emergent animate matter" hypothesis. Panpsychism requires that the universe updates its state by conscious choice, which we already know happens, so from the perspective of Occam's razor we would actually need to explain why it DIDN'T happen for non-animal matter. Additionally, if we go with the emergence hypothesis, we…
Panpsychism requires that we have a solid grasp on what constitutes consciousness, and we don’t. How would you falsify panpsychism? What testable predictions does it make?
This is an inconvenience for every theory of consciousness, isn't it?