As someone who deleted an account on one server to create an account on another, I can say that my comment remained but my username did NOT. I'm not particularly opposed to the comments remaining for the sake of thread continuity.
Personally, I'd like a 2FA option, but the post on Raddle about privacy does not ring true to me. I can't speak to the admin side of things, however.
This is a great example of open communication and community building.