The issue is the frequently repeated, formulaic use.

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"I'm not defending claudeslop, but <defends slop>". People obviously know this. The problem is that using a dramatic rhetorical flourish every third sentence for completely un-dramatic things is fucking tiring. And so are the people defending this shit. "Oh, humans use em-dashes too, so actually there's literally no difference between a human using one or two and Claude using 400 em-dashes in one article". A human using things correctly and a language model using them incorrectly are not the same fucking thing.