Quantum mechanics is a well defined theory and sentience, however you define it, has nothing to do with it. Your reasoning is akin to saying "gravity affects everything so you can't rule out it has some connection to sentience". It's a meaningless statement.

It's not meaningless, it's just overly broad to the point of uselessness.

You may as well be saying that reality has nothing to do with consciousness which is obviously untrue unless you're implying some kind of metaphysics.

Apparently figuring out if a neuron fires or not involves quantum coin tossing.