This is great news. The uncoupling of profiles from a single server (by connecting you to three at once) means your account can't be shut down just because the admin abandons it or tries to censor you.

It's also essentially not been email at all for a long time, at least not in the conventional sense, so this abandonment of the unencrypted part is fine. Unlike Signal, "you can read all your normal emails here too" was hardly a sticking point