No 3rd party app support, more ads that more closely resemble content, payment required to rank highly in replies, non-chronological sorting of tweets when view

No 3rd party app support, more ads that more closely resemble content, payment required to rank highly in replies, non-chronological sorting of tweets when viewing an account's page if not logged in, more prompts to log in if not logged in, missing context (title text) from linked websites. That's just the more objective changes that have made for a worse UX. One could argue that Twitter's overall culture has also gotten worse, but that's much more subjective.