That is surprising to me. I am so tired of commenting on random lines with the usual "commenting on a random line for the sake of threading" apology.

Also commenting on random irrelevant changed line because you can't comment on unchanged ones (but they might need changes due to rest of the PR).

Github code review is horrible and I think it's actually worse than not having anything at all because now it's hard to convince people we should switch to something better. "Oh I don't want to learn another tool, github is good enough"