Follows up T400579: Add ability to make 2FA available to N% of users, and as a further optimisation past T404252: OATHAuth loading more from the database than needed...
Is there any benefit of adding users to the oathauth-twofactorauth group, if they already have the oathauth-enable right? And/or, depending on how we want to look it up, whether they even already have 2FA enabled?