This is an interesting question, one I have pondered myself at times.
I converted via the NO church in existence in the 1970s, but Deo gratias that the priest I encountered that day when I knocked on the rectory door was very trad and despised V2. He stayed out of obedience.
But he schooled me weekly, one on one, using the Baltimore Catechism and Douay Bible. He even talked to me after lessons about the heresies of Feeneyism and Teilhard DeChardinism!
2 months after my Baptism I learned of the ORCM Tridentine Masses being held at a motel and switched there. I never left.
The ORCM under Fr Francis Fenton was a blend of what today would be called sedeprivationism/sedevacantism. I accepted it bc it made sense considering what was going on in the Church. My maternal grandmother had left active practice in 1970 after the NO started, so when I asked her about the Catholic Faith, she told me pre V2 bc that's all she knew.
I remember what Fr Fenton said: we must respect the office of the Papacy even if the man in the office is heretical or false.
One thing I remember noticing about Catholics in my neighborhood apart from my mom's family: they seemed to have a blind, slavish belief that a Pope is to be obeyed no matter what. They gravely misunderstood the concept of infallibility but I didn't realize that until later. I think its why I had little trouble accepting SVism...I didn't grow up with their mindset.