Couldn't you also just have an LLM review the PR and quickly fix any issues? Or even have it convert the PR into a list of specs, and then reimplement from there as you see fit?

I guess my point being that it's become pretty easy to convert back and forth between code and specs these days, so it's all kind of the same to me. The PR at least has the benefit of offering one possible concrete implementation that can be evaluated for pros and cons and may also expose unforeseen gotchas.

Of course it is the maintainer's right to decide how they want to receive and respond to community feedback, though.