i like mastodon's approach - its clean, simple, and easy to understand.
i think the fediverse is just a very hard concept for people to wrap their heads around if they aren't internet savvy or already knowledgable on these things. i think in general there needs to be an easier way to fully explain what it is and get it across to people.
lemmy should def adopt something similar here to mastodon. i think having a default server is smart and probably the right move (with the "Pick your own server" option or something similar right below, just like what Mastodon is doing, so users easily have the option), HOWEVER i think before that happens, lemmy does need to allow migrating and moving servers, and ik lemmy.ml is being overloaded really badly rn in general, so those issues probably need to be sorted too.