Maybe that's just the developer in me falsely believing people are more competent than they actually are, though.
At some point, you have to have a pretty deep understanding of how Linux and computers work to Google the right things, and then understand and apply a fix – or worse, you may have to work out one on your own, which may entail things like reading source code and patching stuff; I'd say I'm somewhat competent as far as running Linux goes, and I've had numerous issues over the years that I was unable to fix, mundane but non-negotiable things like "getting sound to work". Best case, that'll just require more or less heavy command line usage, which only a tiny minority of people have ever used before and which is highly non-intuitive at first.
That amounts to building a very comprehensive set of skills that is completely worthless to most people otherwise, and that you don't need for Windows or macOS, let alone Android/iOS.
(Yes, I know you can buy computers without an OS and you can buy computes with Linux as well - but not enough to be realistic for most folks. I'm pretty sure you can buy phones with a different OS as well but again, not realistic choices).