> Over time, Twitter ceased to be interesting as it turned into people affirming their positions on things they usually didn’t understand very well

I don't have a Twitter account; but I have found Twitter quite interesting to learn opinions of several people on the state of web development, which I used to regularly check out. Some of them have since migrated to Mastodon; others haven't; some of those who had migrated, went back, because, it seems, they were after the audience after all. When Twitter stopped anonymous readers from accessing its user feeds, that was a big disappointment.