I have worked in companies where sloppyness was culturally acceptable. I found that a much worse cancer because there is no fixed line when sloppyness is cosmetic and when it affects code quality and maintainabilty. Code quality just did deteriorate over time as little things started to accumulate everywhere.

Yes, review discussions are tedious, but having an ever deteriorating code-base is worse.

Nit comments are how I indicate areas where I would have done something different but I don't feel strongly enough to block your PR over it. Could be some formatting that I think could increase readability or some code you didn't touch in your PR but if you have time while you are in this file you could improve while you are there.

I always stress these don't block PRs and for the most part they are subjective. I still find it valuable to share these perspectives as they offer gentle ways to impart the smaller parts of "good taste" that make programmers well versed in such things a pleasure to work with.