It's seemed to me that Pax has shifted more toward an impoundist/privationist view of things, but I don't want to speak for him. That's my perception.
Yes. Long ago, I started with R&R, just because that's what I was taught. I didn't put much thought into it.
Once I looked into the whole issue, I started to see similarities between +ABL/"classic sspx R&R", +Guerard des Laurier, Fr Wathen and (now) Fr Chazal. So, impoundest/privationist makes sense to me.
I still think one could make the argument for some kind of R&R, because (legally speaking) I don't see where V2/new mass/any-other-conciliar-changes are binding under pain of sin. I hold this *possibility* because I think God, even amidst this unprecedented crisis, has put limits on what the heretic/anti-pope/non-popes of V2 (whatever you want to label it) can do. Thus, even if one was an novus ordo, or indulter, or sspx, or sede -- they should all come to the same conclusion (if they are of goodwill) -- namely, the conciliar church/popes are not the Catholic Church. And no one is bound to accept these changes -- and there are multiple reasons -- doctrinal, legal, theological, liturgical, etc -- which all point in the same direction. In other words, the papal question could be completely ignored and you can still come to the same conclusion as sedes.