I totally agree with you. I actually think that's what Twitter was originally intended for. But I can't help but think about how a huge portion of Twitter has just devolved into a community of angry, underinformed, unqualified pseudo-activists releasing their rage into the abyss. It's amazing how a completely absurd and incorrect statement can be liked and retweeted thousands of times just because it makes for a good soundbyte. Anywhere else, that behavior would be shut down quick. But not on Twitter. It's almost as if the way the platform is designed encourages the behavior. There is no room for actual discussion, discourse, and statement validation. Just one absurd, oversimplified statement that's subsequently dismissed by an equally absurd and oversimplified reply from another user. Over and over again.
I don't think that Twitter was originally designed for real discussion and discourse, but it's become the Social Activist Platform™, and as such, discourse and discussion are almost necessities. In it's current state, however, it's 140 character format unfortunately aids and promotes ignorant and uninformed statements rooted in mob mentality, killing the possibility of any meaningful discussion or discourse, which could benefit many of the conversations that are occurring on the platform.
Twitter wasn't meant for discussion and discourse, but it's community seems to be demanding that it be exactly that.
That's just my (admittedly biased) take.