The best I can say is that it depends.

Some projects are done entirely in BIAB for certain vanity projects where the client's goal is private distribution to family and friends only—much, much better than commercial karaoke tracks and far less expensive than doing them from scratch. Offering a superior product to these clients at a reasonable price is why I bought BIAB Audiophile all those years ago.

For most projects, BIAB happens after basic tracks are recorded. I then export those tracks into Digital Performer and go from there, sometimes using the BIAB audio, normally quite good, or the MIDI piano rolls and assign my VIs from there. I can no longer use BIAB audio with MIDI in my DAW until BIAB becomes Apple Silicon native, unfortunately. As of 2024, BIAB over Rosetta II no longer plays well with others.

I do not use a separate post production process for audio and never have. Post is for video, film & AV and has been since I started. I never confuse it with Mastering, even if others do.

Mastering all depends on the final medium or media. Broadcast radio, KLOVE (not the same thing!), streaming, Broadcast TV, commercial beds, YouTube, iTunes/AppleMusic Store, CDs, AV etc. each have their own requirements and it's my job to know what they are and Master accordingly as I have been doing over 50 years, now.

BIAB 2024 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5