Joe, there's not a single answer to your questions, but BiaB is certainly used to provide backing tracks in a DAW, and the results can be impressive. I'd suggest listening to some songs in the User Showcase forum. There you can hear the results of other users and (usually) see the BiaB credits for the various tracks. You'll see/hear the spectrum from very select BiaB support (eg, drums only) to 100% BiaB backing. You'll certainly get other points of view on this, but I think BiaB is a powerful tool, suitable for final mixes. Welcome to the forums, and...have fun! Ron

DC Ron
BiaB Audiophile
Presonus Studio One
StudioCat DAW dual screen
Presonus Faderport 16
Too many guitars (is that a thing?)