I think for your claim about what Twitter's good for to have much meaning we'd have to define "tweets" and what you dislike about them. Are you saying the whole idea of breaking a long writing into smaller pieces is out? Do you just dislike the UI? Do you dislike people being able to comment on each piece independently?

If you know what Twitter is you know what tweets are. I didn’t say I disliked them.

The answer to your three questions is “yes”. Other commenters have pointed out some other reasons long Twitter threads are annoying.