I would guess that most boards never considered it. Whether or not they would do it if they had thought of it notwithstanding, I just don’t think a lot of board admins think ‘lets create a place for our users to shit on each other’ and, instead, opt to shut down conversations long before they get to that point.
While it can create much more meaningful conversations, I think a lot of other boards moderate conversations quickly enough and deal with potential trolls early enough that people don’t have time to get that worked up.
I, like others, still spend some time on traditional, but specific, hobby oriented, boards. They tend to have one (or more) general ‘off topic’ forums, but even with that, most people are there to talk about that specific hobby and, even more so, tend to say in a few specific forums/topics within that hobby. Between that and new posters coming to the boards to ask specific questions and old timers enjoying answering them, threads tend not to get too heated. Plus, users tend not to interact with the same people day in and day out like they do here. Less time to get to know people beyond the hobby, I think, means less arguments. That guy I get some great advice from might be at the entire opposite end of the political spectrum as me, but I’ll never know it and don’t particularly care.
Another thing about hobby-oriented boards is that a lot of what gets people fired up here just doesn’t exist there. For example, I can’t think of any examples on reef tank message board where someone will continuously make stuff up and back it up with cites that prove them wrong.
We give people a lot of leeway here. And that leeway often translates into member feuds.
Like ParallelLines said, I don’t see many general purpose boards these days, they tend to be about something specific. On the other hand, you have reddit, and particularly, subs that aren’t well moderated where every thread seemingly turns into a pit thread.
I really miss the 3D printing subs I used to belong to. I learned so much and I think I helped a lot of other people too. But as soon as the Bambu printers showed up those subs turned into dumpster fires. I stopped posting to them when, if you weren’t actively praising Bambu, you got downvoted. I once made the mistake of suggesting there were brands of filament better than Bambu’s.