I don’t know, maybe it is hard for us because things are not really established, we change rules and also consider the potential ones.
Anyway, I don’t want to make things more complicated than needed, that’s why I also propose a rule removal here.
However, I felt like an identity control was a core liberty of users. Not only because one might want to have the control over its identity (because maybe for some reason, he cannot explicitely revoke it), but also for others who want to be sure that if they sign someone who already have an identity, the latter won’t come back from the dead and give the identity 2 accounts.
And I’ve no problem with the fact to say “implicit revocation occurs at twice the delay of membership expiracy”, without it being a parameter. 