@EdCates assuming a real question here:
I think the primary reason is overwork to be honest.
Maintainers are overwhelmed by both existing conditions and new conditions created by the social side of LLMs where people drive-by PR and don't even bother to understand what they're doing. That's not an LLM that's unsociable behaviour. Actual pure LLM based agents or whatever that go around opening PRs are much less common.
I think the reason for the unsociable behaviour is the "publish or perish" dynamic extended into open source.
Additionally some companies donate LLM usage for open source (which is obviously somewhat of a trap but it minimises or eliminates cost from the equation).
The productivity increase counter argument has a lot to do with what tasks are given and how studies get structured. For example if you want to rename a lot of things, a language model is naturally going to have a high chance of getting that done quickly and won't leave you fighting to figure out a way to maintain capitalization in a single pass replacement.
I would much prefer maintainers have reduced load but something that can iterate in the background independently definitely will figure some things out.
Of course there's also the security argument. I'm not sure honestly how applicable it is but people definitely at least feel that it is. There's also the "keeping up" argument that I think isn't really much of a real thing even if people feel it might be.
I personally have very different views on usage between cases where you pay for access versus being provided access. Because in the latter I view it as basically a way to extract money out of corporations.
But I don't think my views matter here at the end of the day because in general people have made their minds up about things pretty strongly and I'm not sure honestly how positive I view that behaviour in general but it's not an uncommon one amongst humans at least.