I'm glad I work in places where there's no such silly pointless rules like how many people need to review a PR.
The PR author asks for feedback if it needs feedback, otherwise it merges it, period.
I don't know why and when the world got convinced that all this bureaucracy is a "best practice", when it's just a practice, that can be good, or a waste of time depending on many factors.
Like do doctors when analyzing your medical records are like "I have a diagnosis, but first let me have two colleagues review it"? No, unless they are at the beginning and it's part of the process or they need one.
And that's way more serious than the crap most HN is writing.
My partner gave birth last month and the hospital had a system where every hour a second midwife would come into the room and look at all the charts and review their colleague’s work with a second, fresh pair of eyes.