Pretty much finished migrating my website, including WordPress, email and core domains to @beasts@social.mythic-beasts.com; seems to be working working fine. My couple of odd support requests were handled great, especially since … I think all of them actually ended up me being a turnip in one way or another!
All much cleaner than the old cPanel set up I had; I can see how that's handy for some, but it doesn't half get in the way if you *know* what you want to do.
Just a couple of secondary domains to do as & when.