>>85061500How does being a biological (or non-biological) machine preclude free will from emerging from complexity?
One can postulate free will to exist in a spectrum ranging from inert matter exhibiting no free will to a perfectly complex system of computation exhibiting full free will, with certain types of complexity asymptotically approaching the latter.
Thus a more apt question would be how much free will do we posses rather than if it exists.
The question of determinism while intuitively seems to hold the answer to whether free will can exist or not, that notion does not actually hold up to logical scrutiny having nothing to say about free will one way or the other. Furthermore as you alluded to with Heisenberg's uncertainty principle among other quantum mechanical observations the question of whether the universe is deterministic is ill proposed to begin with.