If the review tooling is any good, getting the code somewhere it can see it is a convenient way for people to give and receive feedback. As the saying goes, the system is what it does!

(And/but yes/no, I have never worked at NAGFAM...)

I've been involved in so many CRs where I've given feedback over 10 revs, then the submitter cancels the CR and files a new one, for the metrics.

Eh I feel like there are some features where you just have to get in the weeds to even design it and the code review itself is part of the process of designing/figuring out the edge cases.