Not to mention that the discussion is almost guaranteed to consist of similarly short (or even shorter) witty one-liners. Twitter format is just horrible, and its restrictions promote equally horrible behavior where you have to look for ways to convey ideas and feeling in a short manner, which almost never results in more polite and sophisticated conversations.
Never used Twitter for anything more serious than some announcements from the game devs I follow. Anything else is just plain stupid, which makes me really surprised over the wide-spread adoption of Twitter by officials and ministries and the like.
And raising the character limit is going to be even more absurd, because then it’s going to be reminiscent of an actual forum, just less structured and sensible.
Twitter, as a format, is the worst option between messengers like Matrix and proper forums of any kind.