I think it's a matter of perception. There's regurgitation. There's recombination. There's advanced recombination through layers of prestidigitation. And then there's actual human creativity, which you might deny is special, leaving us at an impasse because we can't provide you with a tool to measure it with. It just comes down to a philosophical face off, high noon with hand-waving instead of six-guns.
But anyway the point is that LLMs produce a lot of novel stuff that we feel already tired of because it seems like we've seen it before.