Moral belief arguments for Roman Catholicism and Eastern Orthodoxy implicitly rely on two assumptions which I shall call the "theological trickle down effect" and the "Filioque Effect" argument. Neither assumption is borne out by the facts.
The theological trickle down effect argument is the idea that doctrinal and moral cohesion at the top levels of church government somehow somehow flow down to the bottom. The statistics on social conservatism between denominations show otherwise.
The filioque Effect argument is the idea that highly niche and technical theological beliefs somehow have a great effect on the moral beliefs of the laity on the ground. JWs are the ultimate refutation of this thesis.
Traditionalism is itself a refutation of the thesis in a way. What is held up as the benefits thereof are the thriving parishes. But in each case a thriving parish is a result of local decisions.
To the extent that it is not a result of local decisions, it is the fact that there are a limited supply of parishes, and most traditionalists have access to automobiles. It's considered crass to mention material factors, and it's overplayed in the world, but ignoring them usually leads to major errors in thought.
The lesson for our denominations is perhaps not to multiply churches as much as we do.