maybe someone can explain why after taking a BIAB song into RB with all the extra flexibility, extra tracks, all the regeneration possibilities - midi, midi supertracks and RTs, and easier editing without complicated workarounds RB offers , you might want to take it back into BIAB?
One opens a BIAB project in RB that was carefully constructed using Multi Styles extensively only to learn RB doesn't recognize Multi Styles...
One opens a BIAB project in RB that was carefully constructed with frozen tracks perfect for the project only to learn RB doesn't recognize and preserve frozen tracks. Back to BIAB to export....
BIAB's more fully featured than RB. It is much better to construct tracks and styles in BIAB than RB if you're into a project and find tracks lacking as the project progresses.
BIAB's StylePicker is better and more efficient than the StylePicker in RB.
BIAB's ACW is better and more efficient than RB's.
Projects evolve and BIAB does many things better at track construction than RB or any other DAW. I don't think it's at all unusual to get tracks into RB only to find they are not completely satisfactory for the project and BIAB is the right tool for that job.