Biab main application can be left how it is as a legacy application, or maybe the older 32bit version without all the extra Utility Tracks to make it easy for old users with old hardware.

But you can't hold back development because of old users with old hardware and say to studio users with modern DAW's, "Sorry guys there's nothing we can do for you"

This is Reaper on XP playing RealTracks direct from USB 2.0



This is EnergyXT 1.4 32bit 2005 VST playing all the tracks direct from PG hard drive



Band-in-a-Box runs on Windows 7 / 8 / 8.1 / 10 (32 or 64-bit) and require at least a 1.0 GHz processor (2GHz+ multicore recommended). Basic MIDI features require a less powerful computer than the latest RealTracks features. For best performance, we recommend a fairly up-to-date computer with Windows 7 or higher, a fast processor, and at least 2GB RAM

REAPER supports all Windows versions from Windows XP to Windows 10.

I can understand the drawback in the 90's and Win95 not being able to handle that but it will be 2022, DAW's have had non destructive editing for over 20 years they are using ARA & VST3 now, PG are still using destructive editing from the 90's.
With so many users requests PG made so many excuses not to go 64bit BUT when Apple went 64bit only, PG was forced to release a 64bit version.
You can't hold back the whole of the DAW audio industry development because of "auntie bessies old hand me down pc", did the ARA developers say "sorry guys we can't develop ARA because of bessie, let's leave it for another 30 years" ?

Biab Track Injector for Reaper
Free Biab Chord Picker Tool