Came across a news article about Muhle https://www.dw.com/en/how-shaving-brushes-created-a-hidden-champion-in-germany/a-47761497
I noticed that Muhle cites China as their largest market, and also mentions Korea, Japan, Russia and Scandinavia. Western Europe and North America didn't make the list. Wetshaving in those other regions must be commonplace.