The fuller answer here is that the guys who started Discourse don’t really believe it’s a feature that makes sense, which I guess highlights their privilege. In their view people are either part of the community or not and anyone who might rub one person up badly enough they’d want to block them should already have been banned.
Not to say there isn’t maybe a grain of truth in that last bit. I think most users who have got enough people’s backs up in their style have ended up banned in the end, Mere Pseud Bag Head being the constant example.