The major ease of use advantage Windows has is that it is preinstalled on hardware people buy. If you gave a "normie" a computer with desktop Linux distro preinstalled they would find it much easier to use it than to install Windows.

My experience is that most people like Linux provided someone else installs it for them.

Most software is also written for Windows and won't be flawless in WINE

That is a different issue from ease of use, and depends on what software you want to use. There is certainly a lot of software that is available for Linux.

I am far from sure how you would measure "most". Number of executables, number of GUI apps...?. These days there are probably more GUI apps for mobile platforms than for desktops in any case.

A lot of the most commonly used software (e.g. web browsers) is cross platform.

Of course there is a lot of niche software that is Windows specific, but a lot of that has or will move to web based SaaS (not a good thing in my view, BTW).

Most mainstream apps that normies are already familiar with

Ah, facebook then.

and google

Most people use their computers just to browse the internet and maybe run a few electron applications.