There's some broader going people aren't seeing.
The Catholic Church during the medieval period was incredibly corrupt and full of simony, power games (with the Holy Roman Emperor, the King of France, Naples, Spain, England, between cardinals, whatever). Those corruptions caused the Church to spread heretical ideas that had nothing to do with God's Will, but rather just money or power, using "the Church is infallible!" as a cover.
Jan Hus protested the church, the church promised to give him free passage to talk about it, then said ''sike!'' and murdered him. Luther and Calvin weren't right about everything - thinking predestination is factual is heresy - but they had a lot right.
The Church wouldn't turn around and fix their issues until Vatican I and II councils. (Allow local language in the reading of scripture or prayers, shorten mass to make it easier for people, have the priest turn to the audience to serve the people rather than be distant). The Protestants too have turned around in the right direction in a lot of cases; predestination, in the Calvinist churches, is rarely seen than more than the theory they forgot about. And the political powers that drove Catholic church policy have been eroded over the last decades; for the faults of the Pope John Paul, what he did correctly is spread out cardinals over many nations, eroding local politics from interfering heavily in Church business.
However, this isn't without flaws; Vatican II didn't address concerns about liberalism properly, but *all* churches are now battered from without and within by liberal heresy and agnostic attacks. That doesn't mean the Sedevacantists or the SPXX club are correct or that old mass should return.
The Orthodox, meanwhile, have lost the overpowering presence of Moscow after the war of Ukraine (or SMO whatever you want to call it) started, with Kirill losing the plot entirely. This causes the Greeks, Serbs and others to be able to talk to Rome.
(cont)