Sure, give a somewhat intelligent person between 20 and 40 a PC with Linux on it and they’ll figure it out. However, that doesn’t mean they have the patience of finding out how to install Linux in the first place. And also, they‘ll figure out how to install apps, sure. Until they try to download the installer.exe for Microsoft Office because why would they know that it won’t work.
The problem isn’t, that they couldn’t figure it out, the problem is most people just want a working computer and not relearn what they already know or learn what an operating system is at all.
(And also, I remember reading some study, that a lot of late Gen Z and younger (the ones that didn’t grow up with Windows XP or earlier anymore) are actually less tech savvy than older generations because they’re used to not really having to troubleshoot tech)
They‘re everywhere and while the quality isn’t great, it’s a known quantity. McDonalds is never amazing but it’s very rarely terrible. A random hole in the wall is always unpredictable and a proper restaurant usually much slower and more expensive. Also, I’m weak for the Big Tasty sauce.