This is a symptom of the same "backwards" approach to worldbuilding - i.e. the author just thinks "What do rich people do for fun?", doesn't even really think historically beyond like, the 1920s very often (let alone do historical research to get any ideas - I mean you don't have to then follow those ideas, but it's good to know), and then puts it pretty much straight into their setting and works around that, rather than the actual worldbuilding approach where you think about the society you've created, and what resources and traditions the nobles have, and what they might be doing because of that (what social benefits and so on).
I'd say it's pretty notable how different and more diverse and organic and complex the societies of people who use "forwards" worldbuilding (like NK Jemisin, when I think of "proper" worldbuilding in a modern fantasy novel, I think of The Broken Earth trilogy) are to authors using more "backwards" worldbuilding (though being everyone does a bit of both) but I think there's a real question as to whether most audiences care about this or even notice the issues.