Common sense prudence tells us we stay away from things that don't look Catholic. So that means the novus ordo, liberal clergy etc. etc.
To what extent is this common sense? If Vatican 2 is Catholic, then all this stuff is Catholic. The Novus Ordo Mass has been celebrated by 99.99% of Catholic priests for longer than most of us have been alive. It's not at all common sense for a Catholic to wake up one day and just reject all that.
R&Rs have this hypocrisy where they simultaneously expect everyone to use their judgement to dismiss Vatican 2, NO, 99.99% of the clergy, and everything the Pope actually does or says, but the when it comes to the identity of the Pope itself - suddenly it's just "if he's recognised as the Pope, then we just have to assume he is".
The logical conclusion of R&R arguments is NO conservatism. It's totally incoherent otherwise.