I would argue that the change from Win10 to a KDE linux or a similar windows-like UX is similar to a change from Win7 to Win10.

Its fair to say that even the Win7 to Win10 switch is something people only do if you force them, but I could see the Win10->Linux change happen for a lot of people if they saw anything it had that they needed.

Not having to worry about AV and automatic updates, automatic download and in-OS-ads would be pretty huge already.

Yes, most powerusers on windows know where to turn all that off, but a lot of people, like my parents, are scared to fuck something up, so they dont touch any settings, especially not if windows tells them "this improves your experience, you sure you wanna turn it off? nudge".

A lot of people would not notice or care if you switched their machine to Linux - as long as it means they have to worry about less.

You should be able to install most distros alongside windows without any extra work, just in the installer. UEFI+GPT boot is an option, and that never required me to fuck with the uefi setup, it just installed itself into the EFI partition together with windows's stuff, and you could pick in GRUB "windows" or "linux" :)

Steam has that.