The more I learn about how the bigger companies do business, the happier I am my dreams of working for them never materialized. I encounter enough stupid things caused by businesses trying to measure difficult things. I would hate to work in a place where the proper mode of conduct – praise in public, criticize in private – is flipped on its head for the purposes of someone's spreadsheet.
It was definitely a bad system that leads to wrong incentives.
Due to this, a lot of the time, leaving a comment would lead to friction with the owner of the CR, thus disincentivizing leaving comments, which leads to worse code being merged.
So actually putting positive comments in the code review isn’t really much appreciated.
I gained this habit and now for me, a comment is a suggestion of improvement, I deliver praise out-of-band.