This isn't a moderation tool, it's effectively a communal way to remember usernames of people who've been abusive. Do you have the same worry about people blocking you for your past views? I've said awful, transphobic, homophobic, and racist things under past usernames (part of the reason I switched to Starman was to distance myself from the persona I had 15 years ago), and I'm sure some people rightfully blocked me when they saw those comments. Personally I would rather someone see a red username over a comment now that I'm an ally than not see my comment at all.

Like I said, they are strict. Unless you are unabashedly transphobic, you won't even accidentally say something that might get you tagged. Kind of like how a white person doesn't accidentally use racial slurs unless they're racist. You shouldn't have to worry about a video of you calling someone the n word going viral because you shouldn't be calling people the n word in the first place.