>> Why would they teach something they don’t consider a FINAL AUTHORITY, anyway? <<
Because they DO consider it a final authority!!! The very first test of whether an apparition is genuine, or a doctrine to be considered by a pope is true, or the teachings of a saint are true, or a position to be considered by an ecumenical council is true is “Does this conform to the scriptures?”
But of course you don’t believe that because
(1) There are many points of disagreement between reasonable people as to how to interpret the scriptures, and you guys discount the consistent teaching of the Catholic church since the first century, and therefore presume that the Catholic Church must’ve made it up and
(2) You have your own, completely false ideas about what the Catholic Church teaches. If you want to credit them to a giant extended family, fine, but that extended family of yours is not the Catholic Church, just a few apparently devastatingly poorly educated Catholics and ex-Catholics.