The problem I have with BIAB is my songs often have very specific fingerpicking parts. BIAB can't easily do the same picking as far as I can tell. (Or maybe at all?) So I'm thinking an AI like the one in the OP may be able to pick up on my specific fingerpicking but just do it more accurately. And then add other instruments that closely align with those parts.

If I'm missing something about BIAB, let me know!