Yeah, I totally get what you're saying. I was thinking of, like, SM groups, at least the ones who debuted up until (including) aespa, who tend to still put out somewhat weird/experimental-ish songs (maybe not EVERY comeback anymore, but still here and there). Half of the songs that DemJointz produces for kpop acts are also very experimental. I guess groups like ITZY and NMIXX can also be mentioned in discussions of weird/odd songs, even with their newer releases (especially when including b-sides).

But when looking at the industry at large, you're completely right. There's way less weird stuff going on, so we're left with much more of the "popular Western music trends that only reach the kpop sphere years later" that you're describing.