It has been said that sedevacantism adds nothing to the traditional Catholic movement.
That's not entirely accurate, to be correct, we say sedeism adds nothing *good* to the traditional Catholic movement. Which, we call it a "movement" but it's no movement really. What it is, is preserving the faith.
I would like to know exactly what the R&R movement is resisting? You recognize Jorge Bergoglio as your pope. The R&R folks apparently believe that the Catholic Church can promulgate error and heresy to the universal Church, that it can give evil doctrines and disciplines, and that it can promote a Protestantized "mass."
The so called "R&R" is resisting the heresies of the conciliar church and new religion
by keeping the faith. Because we accept that nobody on earth can do anything about heretical popes, we do this without regard to the status of the conciliar popes and hierarchy, exactly as we have since this crisis began - because they are all heretics and preach all manner of error, we cannot listen to them. It's just that simple.
Sedes, for reasons only they know, confuse the situation by complicating it with absurd cliche's, like R&R
"had to throw overboard Catholic teaching concerning the papacy and the infallibility and indefectibility of the Church, and the infallibility of canonizations" and on and on and whatever else on and on as they divide out from other trads over it.
These cliches are mostly total BS, although some of them are something less than total BS, but BS none the less.