but generally people just don’t install Windows, it’s already there

In my opinion that's the main point.

People love to discuss how Linux isn't fit to replace Windows (yet) or how it needs to be more user friendly or how it needs to work better out-of-the box.

Yet in reality 90% of the users couldn't install and properly set up either OS from scratch. But with Windows they simply don't have to as it's already pre-installed and set up. And so they somehow fool themselves into thinking one just runs automatically while the other needs additional work...