I’m not in those communities anymore, but is stem separation not legit useful?
Also, they're sort of an legal-ethics dilemma in that The only time you would really use stim separation is if you don't have the stems already, and therefore almost certainly don't have clearance and can't really use them for anything commercial. Probably not as big of a concern but definitely something to consider.
Really the big one is that a lot the creative online community and especially the kind of community around Bitwig has a pretty strong opinion against generative AI, which includes things like stem separation.
I've never actually seen Bitwig the company refer to "AI" in any capacity, probably be cause it's not relevant to what they do or make, so no "virtue signalling".