[EDIT] OK, some explanation is in order: because it's very bad at curbing posters who are either trolling or just very bad posters but it's not clear which (which is, precisely, what a classic troll is, when this is achieved on purpose), and its anti-poster-recognition design makes that even worse. Just let me block the ones who I find consistently posting what are either super-ignorant takes or are trolling, because it doesn't really matter to me which is the truth.