Windows admins typically use Windows because a)that is what most businesses use and they are therefore a product of the modern landscape and b)they have lives outside of tweaking software endlessly and prefer a simple and complete integrated environment from a single vendor. Those are the reasons I use it for example.
Your claim that they are using an inferior product because of their inferior skills is a logical fallacy, if the average admin wanted or needed software complexity or major incompatibility issues, they would most all certainly be using Linux or some other obscure half baked product. But of course they do not, nor will they ever, they will use what is easiest, to most everyone on the planet, that of course at this point in history being Windows.
You seem particularly sore that most people in the US and the entire world choose to use Windows, but to claim they do it because it has more bugs or is harder to manage than something like linux is completely absurd. Few people use Linux on a large scale because it sucks to manage, not the other way around.
You just perfectly described Macs.
Few people use Linux on a large scale because it sucks to manage, not the other way around.
Revisiting Largo, how is it that they run their Linux infrastructure on a staff of six, which is far fewer than is normally needed for a comparable Windows setup? Microsoft even came in and tried to woo them back to Windows, but had to admit that Windows couldn't cut it.