For those that can't stand Twitter's UI: https://threadreaderapp.com/thread/1345146328058269696.html
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As an authoring medium though, the character constraints force you to write succinct points that keep the reader engaged. You can focus your writing just on one point at a time, committing to them when you tweet, and you can stop anytime. If you're struggling with writing longer form pieces a tweet thread is a great on-ramp to get the outline together, which you can later expand into a post.
As a conversation medium, it's also nice to be able to focus conversation specifically on a particular point, rather than get jumbled together with a bunch of unrelated comments in the comments section at the end of a post.