Yes

> It creates a world were we won't be able to un-dumb ourselves because they will be no divergence away from the dumb mass of humanity.

Based on the grammatical errors, this dumb human is definitely using AI daily

Can confirm that wasn't written by an LLM. To many spelling mistake

I'd be quite interested to see a study of some kind about this - for example, tracking diversity of word choice, phrasing patterns, rhetorical devices etc among human-authored text - compared over time among groups of heavy users / moderate users / non-users of LLMs.

Obviously the concept of "individuality" is fairly tricky to operationalise but still, it might be able to indicate a measurable effect and if so, that would be fascinating.