Pair programming > PR reviews.

I've heard people scoff at the $$ cost of "mob programming". I think that view is totally myopic, for appropriate problems there's just no faster nor higher bandwidth way to transfer code knowledge in a group.

Plenty of people dislike pair programming, i don't dislike it but i do find it mentally intense, tiring. I really really enjoy that it's an accelerator for getting to done - not just i wrote the code but the code is correct - sooner.

Long way to say don't rely on pull requests when you could be doing pairing for the important stuff.