I agree these things you mention exist. Where I disagree is with the significance that designers place on them.
They rock a designer’s world. They rock a tiny portion of the first world. That’s it. Funny no designer here has mentioned country music, #1 at least in the US. Why do you suppose that is?
I’ll walk into Target today and see the vast majority being non-modern design. Sure, I can find modern, but how long did Phillipe Starck’s stuff last there? 1 second? 2 seconds? And steampunk? Really? Give me marketshare numbers. Let me know when it breaks 0.01%.