SteveM:

This was bandied about on the forum earlier this year, when BIAB2022 was available,
but the discussion got bogged down in AI (artificial intelligence) references.

Regarding your post, I believe that your suggestion "BIAB could analyse an audio file ... and give a shortlist of perhaps 5 Styles that would probably match that audio file." is pretty much what BIAB does now,
although the list of styles it pulls up is more comprehensive.

Even if BIAB had an algorithm (like RipX) to figure out what instruments were playing (and perhaps BIAB already does), it's not much help when it comes to applying the parameters to suggest a style.
Thus the previous AI discussion.

You said: "A big collaborative list might be handy".
That would get my vote with a big PLUS ONE!

LLOYD S