Changed my Bluesky handle to my home page https://j12t.org. That was quite painless (for a geek; I filled out their web form and added a TXT record).
They did that quite nicely. We should have something similar for the ActivityPub Fediverse -- yes, I understand that's a bit harder to do but not impossible IMHO.
@J12t Totally. Changed my Bluesky handle too to my domain painlessly. This + the ability to choose your own algo separate from the network are two great features there that we would hopefully see replicated in more social media networks.