One significant thing #Fediverse ecosystems lacks is the ability to migrate your account along with the posted content. Also, every single #ActivityPub software I've looked at states that changing server implementation without changing the domain is not supported, don't even try (which kinda makes me want to try just 'cuz). Which means if I ever decide to change the software I host my blog on, I have to wave goodbye to the posts I wrote previously. Sure, most of them aren't that notable, but some of them might be?