This is the type of issue where the modernist has a lot of plausible deniability for the average church-goer.
It's quite difficult to prove that the reason for the total rejection of traditional Catholic art and architecture is the rejection of Catholic doctrine.
However, a little bit of reflection makes it very clear - these buildings seem to be empty of spiritual significance, they do not seem like dwelling places for God, because they're built by people who do not believe in God, certainly not the God of Catholicism.
Paradoxically many trads have the opposite problem.
They can see what's wrong with the modern styles of art, architecture and music in churches, but they can't understand why it's wrong.
So long as their conciliarism is given a traditional veneer they have a hard time understanding the problems.