I may have thought a little too far. My point was that people need multiple accounts, for example to share their content in a forum. Unfortunately, OpenID, which is used by Hubzilla, is not yet widely used.
The fundamental question is how do you make Fediverse attractive to people?
Is there still a registration hurdle? I got onboard a few months ago and can't even remember what the big deal was.
I remember being pretty confused about which server to create an account on — wondering how much it mattered and how to select one. It's a "forced choice" step, and each time you have to stop and make a decision people will drop off.