Sure, playing chess needs intelligence, dedication, and good chess players are smarter than an average person. But it’s waaaay exaggerated in movies. I’m a math researcher, and in any movie, my department will be full of chess geniuses. But in reality, only about 10% of them even play chess.
I also think it’s a generational thing.
Back then, since chess was associated with intelligence, a lot of academic types tried to play it and get good at it.
I would say once we had computers, there was another much more practical thing you could get good at.
But seriously, chess sets used to be part of the house decor.