[satvikpendem]

> The more interesting question about determinism is in which way it is deterministic? Like the movement of the planets? Like the weather? Or like brownian motion? Probably a mix of all of those, but what mix?

Yes, as I stated, if you follow philosophers of the mind, they cover all of these aspects and more. It is hard for me to go in depth without rehashing their arguments so I will invite you to study them.

> there would be no way to test that theory with two separate human entities and no way to make accurate predictions on long time scales, which makes the whole point kinda moot.

Just because this is the case does not make it untrue. There are lots of things we cannot fully test with certainty (in the Locke epistemology sense) that we nevertheless assume to be true. This may or may not be one of these cases, but it does not make it "moot."