I disagree, and I’ll use my own personal experience as a mod here to do so. Despite, over and over, asking people to flag bad posts instead of responding, there are many, many folks who explicitly choose to respond anyway, or just can’t help themselves when they see someone saying something wrong on the internet (I’ll actually go further and bet that just about everyone has that one topic that when they see it misrepresented can’t help but respond, me included.
Now, imagine if your favourite debater here on the BBS realizes that “hey, if I don’t want to debate with gracchus, I can just block them, now I can make my point without having to listen to them!”. In fact, unless we restricted the size of a blocklist, folks could just block anyone with a contrary opinion in a given topic, and their otherwise-within-the-guidelines post would stand unopposed.
I have zero doubt that folks would seethe over this - that they’d call foul and demand the post be removed or that they have the right to respond to it. There are umpteen folks we’ve removed from the BBS that would have absolutely loved a feature where the people who disagree with them most simply couldn’t click reply or quote their responses!
But here’s the other thing. It wouldn’t work anyway. Because folks would find a way around it. Case in point, we’ve tried to remove certain incendiary or toxic words from the BBS, that would otherwise hold posts in moderation. Folks nearly immediately found ways to use those same words and bypass the filter. If we said users couldn’t quote or respond to comments, they’d immediately just paraphrase the comment, or blockquote it, or other form of brinksmanship (like spinning up a vpn and creating a new account to reply).
I have, as a moderator here, seen every one of these tactics employed. none of them are theoretical. It’s because of these very sorts of issues we don’t try and control who can say what to whom if it’s within the guidelines. Instead, I want folks to have the ability to choose what comments they want to spend energy on at all. If there’s a user that you do not want to waste brain cells on, they shouldn’t exist to you. Their comments, and comments that reply to that user, or quote their replies, should simply not exist to you. But the feature doesn’t work this way now. Instead it says “Oh look, the person you want to not pay attention to posted! But you can’t tell what it is!”, which in a lot of cases does the opposite of “out of site, out of mind”, instead it’s “Well, now I have to look because who knows what they said!”.
Whether or not the Discourse folk are even willing to go that far, I don’t know.