Linux

Yeah but that's precisely the thing isn't it: you need to know Winboat, Gnome Boxes, VMs etc... exist, you need to know how to configure it and how to use it.

I've installed Bazzite a while ago for my sister after my old gaming PC didn't support W11 which I donated to her. Took 2 reinstalls because apparently it's very easy to mess with hard drive mounting in a way that bricks the OS into an unrecoverable boot loop. Then, I needed to get her games working through Lutris, which did eventually work but updating those games then became an issue. I know how to do it, but she still has difficulty getting the steps right. Had I left it to do it herself, she would've been far too intimidated to even get started properly (and she's above-average when it comes to computers). And of course 90% of computer work happens in the browser, but people are unlikely to switch if that remaining 10% doesn't also just work out of the box.

Arguably this all isn't Linux' fault, but that doesn't magic the issues away. Windows is just a lot more familiar and harder to brick beyond repair. Of course it's less powerful and more bloated, but managing to get a Linux install to that point is often still quite hard for many people. And the average person has very little patience to make something work.