Nailed it.

Then there’s the absolutely abysmal UX of following someone who exists on another Mastodon instance when you’re linked to their profile, which involves the non-obvious steps of manually copying and pasting a URL into a search box on your home instance, waiting for a connection to be made, then following them, at which point you won’t see any of their old posts, just their new ones. Compare and contrast with Twitter’s handling, which is where you search for a username and can see all their posts and can follow them without having to manually copy and paste a single damn thing.