I think that in practice the problem comes down to preventing sociopathic sadists from annoying everyone in complicated ways. The actual level of anonymity does

I think that in practice the problem comes down to preventing sociopathic sadists from annoying everyone in complicated ways. The actual level of anonymity doesn't really matter but there are classes of solutions that work better without. The only possible non-technical solution for that class of user would be to track them down in real life and fine them. The possible abuse associated with such a scheme make that sort of solution unattractive.