Especially because a HUGE benefit of code reviews is exposure and knowledge transfer. For us it's a key area where anyone can get insight into the how and why,

Especially because a HUGE benefit of code reviews is exposure and knowledge transfer. For us it's a key area where anyone can get insight into the how and why, plus control their participation from requester/reviewer to passive observer. It's actually a pretty poor place to catch bugs introduced by new, junior devs.