I think there's valid criticisms of Twitter; the medium encourages a writing style that I find pretty cringe-worthy a lot of the time. It does encourage hot takes and isn't a very good place for nuanced discussion of charged topics. It is, like all social media platforms, a contributor to polarization in all sorts of topics, some that matter more than others.

The value in Twitter depends heavily on how you curate your feed, though. If you fill it with thoughtful people that are experts in the fields you're interested, it can be quite enlightening. If you fill it with people who mostly post memes, you'll get memes. If you fill it with pundits, you'll get bite-sized takes. You get to choose that.