But to just open an account, average Joe (and his grandma) has to grasp the concept of an "instance", which is confusing because it's so different to his habit of just digit the letter y on his browser or tap the Youtube icon on his smartphone.
Also, he doesn't need to use the search box at all most of the time, because his feed is powered by algos that are programmed on the same lines of those found in slot machines. So he just keep scrolling, like a gambler keeps pulling the slot bar at a casino.
So, like I said, the fediverse is a fascinating concept, but, at least at this time, is for people who explicitly want a different kind of experience, because its UX can't compete with mainstream social media. And perhaps, this may be also a good thing.