Earlier quoted context omitted.
Apparently some accounts can have their edit window muzzled if a moderator chooses to. I have a reduced 10 minute edit window that was applied to my account without notice or explanation, it's fully possible that you might have one too.
[flagged]
The lapse of communication is what bothers me, and I suppose it's because the moderators know they can't justify the punishment. Preventing someone from protecting their posterity is a pretty selfishly punitive measure, even if you think they abused the edit feature (somehow). It also doesn't prevent future abuse, doesn't communicate how the user can improve and therefore results in a worse community than just banning then and flagging their comments. I don't understand what the purpose of edit restrictions are in their current form, and clearly other users don't either.
It's really my fault, for coming to Hacker News and expecting to be owed anything. I should have known better than to openly criticize the tech industry on PG's own stomping grounds.