Even though it might be true that we are just brains in vats seeing computer simulations (and I recently learned the original plot of The Matrix), does it matter? We might as well act as if we are what we appear to be, since the alternative is just nihilism: nothing matters. It's the better wager to make.
I feel the same way about #FreeWill. I don't think we actually have it, but we might as well act as if we do since determining the difference is too difficult to be practically useful.
Nerdfest