It's simple J4, they have no answer for us. They broke away from real Catholicism---Orthodoxy. After having done so, they've marginalized the groups that broke off from them. They delegitimized the Anglican Church with stuff like the Nag's Head Fable and tried to claim they had no apostolic succession. They delegitimized the Lutherans and other groups because they lack holy orders or don't have this or don't have that. But with Orthodoxy there is a massive body of people who are LITERALLY more Catholic than the Pope who have a far superior liturgy, the venerable theology of leavened bread, powerful saints, awesome pure theology unspoiled by scholastics and modernists, undisputed apostolic succession, and everything they have only in spades and unspoiled. What do you do about that?
Catholics believe without the pope you can't maintain the Church and have cohesion, the majesty of the holy mysteries unmolested, and a pure theology or liturgy. They think everything outside of the papacy is defective and collapsed.....and then there is the fly in the ointment----Holy Orthodoxy.
How do you claim those defect arguments and explain Orthodoxy? The only way is to downplay things and have a quick drive-by approach to the East.