It’s quite like reddit, but without threads or subs: just a nearly infinite list of comments made on anything. You only get to see what a comment (tweet) is about when there’s a tag on them or when they are a response to another tweet.

Twitter’s UX was generally better suited for some stuff like live events where you may want to see other people’s comments but only in real time - a 3 minute old tweet in this context is just useless data.