9000-line PRs were never a good idea, have only been sufficiently plausible because we were forced to accept bad PR review practices. Coding was expensive and management beat us into LGTMing them into the codebase to keep the features churning.

Those days are gone. Coding is cheap. The same LLMs that enable people to submit 9000 line PRs of chaos can be used to quickly turn them into more sensible work. If they genuinely can't do a better job, rejecting the PR is still the right response. Just push back.