They don't. They switched over to iPad 10-ish years ago. Most normies I know use phones and/or tablets full-time for their personal computing. Laptops and desktops are either work machines, for games, or for work without wages (studies, excel, other things which are inconvenient or impossible on a phone).
Grandma is on Linux Mint since she still wants to do her banking on a computer and not an iPad. She'd be on Windows 11 if I weren't her tech support, since then she'd have bought whatever idiot at the local shop would have recommended, wasting a lot of money, and probably still have thrown her arms up in despair after a while due to the shit user experience. If the local shop had machines with Mint preinstalled, I'd imagine that would have gone well, if a lot slower than it would have with my help.
No Windows casual out there has ever even installed Windows, never mind another OS, on their computer, even if they theoretically want to. They can't have what they don't know about, and that barrier is probably never going to go away.