Twitter is a huge, huge place and your conclusions are massively over-generalized. There's lots and lots of good stuff: analysis of news stories, humor, statistics, low-level or amateur reporting. Covering tons of niches: sports, politics, music, "Black Twitter".

It's true that it's a poor platform for adversarial conversation or debate, but that's no reason to dismiss the whole thing.

I've been on Twitter for seven years and in that time I've curated a timeline which is, bar none, the most entertaining and informative web destination available to me, specifically tailored to my interests and disposition.