Comment by Shacklz

PRs are the final chance to avoid mishaps; be it some junior overdoing DRY, be it someone in the team misunderstanding (or insufficiently understanding) a requirement, something being forgotten, edge-case missed - practically anything! Before/During PR, a single person owns the code, after merge it's everyone in the project.

Someone who just rubberstamps PRs works either in a completely different setting than anything I can imagine or it's just someone who doesn't take ownership & responsibility as serious as I'd require people I want to work with; I can't quite see much room for gray area there...