Helpful error messages around comment restrictions would be awesome

I was just writing a response comment to someone (on desktop) and when I hit post, I got a little error banner in the lower right that just said "server returned unsuccessful result." Thought it was just a backend issue, so I waited a few moments and tried again. Same error. So then I thought it might have been rejecting the angle brackets I was using to try to quote the person as an injection defense – tweaked my comment to remove those, hit post, same error. Then I thought maybe it was just because I am on the wordy side, and maybe there was an invisible character limit on comments. After my second pass of stripping out words here and there to tighten up the comment, eventually one finally posted. Would be great if the error messaging on comment submission could be a little more verbose, so users can know if it's actually a backend issue (and they should just wait before trying again) or if they have to actually change something in the comment body.