If you're setting up an email client you're almost certainly doing work on the computer and anyone who has setup outlook can setup any other email client so that's maybe not the example to use. But you're right in the sense gaming, office environments and schools are the major groups that train window users.

Competitive gamers want edges - a better mouse, a better keyboard, a better internet connection. The latest performance metrics show linux running many games better than windows so this means a major inflow to windows is losing out to linux.

The weird part about all of this is that macbook sales are also up like 4%, suggesting overall a move away from windows. And for most of those apps you listed they also work on mac.

If linux is eating the gaming environment and the mac office experience is better than windows (due to MS enshittification)... the thing keeping windows in place is legacy software, corporate products, oem deals and like historical precedence.