Examples of some of the things that are now changed, sub-optimal, or just plain broken:
* External links no longer appear in the actual tweet, you now need to click on the tweet to see the link to click to get to the item. Two clicks instead of just the one.
* A middle-click doesn't work any more - I constantly use that to open things in a new tab so I can then rapidly run through multiple conversations and links. Not any more, they rigorously enforce the inefficient, linear experience.
* You now need to click to get more tweets, and it lengthens the existing page, rather than loading a new one. That rapidly becomes unusable on my mobile device.
* It no longer indicates if a given tweet is part of a conversation, so now you have to click on the tweet, and it flash loads the conversation, if it exists, taking away my ability to control how much stuff I download.
* The "search" function does not turn up every instance. For example, this search:
https://mobile.twitter.com/search/ColinTheMathmo
... does not find this mention:
https://mobile.twitter.com/noodlemaz/status/2180626418962350...
* While composing a tweet I now can't use the mouse to select, cut and paste text, and the END and HOME keys don't do anything. They used to.
... and so on.
Bloody annoying.