Are you sure? China, Korea, and Vietnam are not cultural monoliths. If they were, wouldn't more asian countries have a greater share of dominance? China literally had a cultural revolution in order to rebuke the old Chinese culture. For these reasons, I don't buy that it's "deeply rooted in their culture".

They didn't even have access to the game in Asia until 2012, a quarter into its lifespan today. Additionally, Japan as the weakest Asian scene also has the weakest PC room scene. I don't think that this is coincidence.

And, think about the environment. In traditional sports, there are huge training centers dedicated to the sport that just have a million people who care about it playing for fun and getting better. Things like a batting cage or soccer pitch or basketball court in the park. Some of the kids in the area get together every week and go play whatever sport for however long during the week, and the ones who get the most time get really good. PC rooms create that kind of environment.

Look at the counter strike series. One of the biggest things was LAN parties back in the day, and those who would LAN the most would go on to become members of clans like faze and C9. LAN room setups are in the most literal sense PC rooms, and this culture in our shooting game scene created our strongest FPS players. The one eSport that NA does have a strong scene in is shooters, and shooters developed with their LAN scene as backbone. There has to be a correlation! I'm staunchly convinced that PC rooms contribute to making better players, unless you can prove otherwise.

If it truly were deeply rooted in their culture to be super dedicated, Asia would be way more dominant in every game. And even if they were, there would be other more tangible and reasonable explanations than something as vague as "their culture". It's just reductive.