I was reminded of that by this review of Joseph Heinrich's book The Weirdest People in the World:
"Standing apart from the community, primed to break wholes into parts and classify them, Westerners are more analytical. People from kinship-intensive cultures, by comparison, tend to think more holistically. They focus on relationships rather than categories."
Players in games go on and on about their character's traits and foibles in a way that somebody from a non-Western non-industrial culture probably never would. It's a habit that has only got worse as an obsession with story tropes and character arcs has taken hold in roleplaying. It's a very 21st century mannerism to tell people that you're on the spectrum (if it's a spectrum then who isn't?) or to narcissistically expatiate on your life goals and attitudes.
I'm using Tekumel as an example, but this applies to all RPG culture gaming. There's a lot of it about, I'm glad to say. Some friends of mine are currently playing as Gwich'in tribespeople in 19th century Yukon. I make periodic stabs at publishing my and Jamie's Tetsubo game set in the Sengoku period. And I don't need to tell you that the medieval Europe on which Legend is modelled is a very foreign country to us today. These are all good examples of culture gaming, but it only pays off if the players are willing to make an imaginative leap outside their modern mindset into the perspective of an entirely different time and place.
Does it matter? Well, you can roleplay any way you like. Do whatever you enjoy, sure. But I would say that roleplaying is rewarding when it takes us on an imaginative leap outside ourselves, and that counts double when it allows us to slip outside our cultural preconceptions. Then it isn't just fun but it expands the mind and lets us appreciate how richly varied the human race can be.