It's a better situation than Mastadon because you can keep your handle. On Mastadon when you change servers you get a new handle since they are tied together.
Yes and no. If you follow the Mastodon migration process, your old handle(s) forward to your new one(s).
What you lose (at least last I checked) are action notifications based on your forwarded handle(s). This mostly doesn't matter, though in my case I have one mildly-viral toot which occasionally gets rediscovered. Missing out on the notifications storm there is mostly feature rather than bug.
