I'd kick it back a step, maybe as a spy novel plot, its no secret that "forever" the left promotes that all cultural advancement only comes from the left, nothing culturally worth anything comes from the right. I'm not trying to promote it, I'm trying to observe it. This has been a constant for an extremely long time. Meanwhile the Russians were a little authoritarian and locked down their art... why? Well one "spy novel grade of plot" is the Americans will fall for the bait and then they can keep an eye on the americans given that the artists tended left wing anyway.
Of course the rabbit hole never ends and a even more "spy novel plot" is the americans knew the russians knew so seeing as modern art is pretty much a waste of time WRT geopolitical struggles, we likely fed the artists a side dish of disinformation knowing that some of the disinfo will get back to the russians.
I guess the orthodox right-wing view is that "progress" shouldn't apply to culture at all, and that it actually ruins culture: a person thinking of progress will never build the Sagrada Familia, only the Barbican Estate. (Similar examples can be found for music, literature, the visual arts, etc.)
Well, it's a Catholic basilica in a mostly Gothic style that's being built for 100 years. It incorporates some ideas that were new for its time, but so did the Notre Dame (flying buttresses).
I guess traditionalists are not against all new ideas, they're more against thinking that old = bad.
That's certainly my view, at least: good and bad are orthogonal to new and old. There are periods where new tends to imply good, others where new tends to imply bad (think of the material culture of the '70s), and others where there's no particular correlation; but if something doesn't contravene your values and objectives, there's no particular reason not to adopt it.
Of course, sometimes things turn out to be more hostile to you than you expected them to be, so caution is in order -- but not paralysis.
Of course the rabbit hole never ends and a even more "spy novel plot" is the americans knew the russians knew so seeing as modern art is pretty much a waste of time WRT geopolitical struggles, we likely fed the artists a side dish of disinformation knowing that some of the disinfo will get back to the russians.