You stated that there have been doctrinal changes in recent decades. Says who?
If you don't think there have been doctrinal changes in recent decades, fine. If you do, fine. I would be willing to argue the substance, but in the end, your decision is your decision. But if you tried to say anyone who disagreed with you was in sin, that's something else, no?
My discussion with Pax has spread out a bit, but my main point was: if I don't trust the superiors to do the right thing on holy orders, then I wouldn't be there. If the priests can't be trusted, why go? For the sacraments, but otherwise ignore them? So the priests are sacrament vending machines who can't even be trusted with the sacraments?
And this should apply elsewhere. The SSPX has been the context because it's is a common venue for conditional ordinations.
"By this shall all men know that you are my disciples, if you have love one for another." (Jn 13:35)