i think there is a fundamental reason why linux is a good operating system. It’s the same reason that vehicles from the 70s and 80s are so beloved, because they’re easy to repair. Hell you could probably rebuild one in your garage, sure you’d need some level of knowledge to do so. But it’s all out there, and very easy to access, and same for the parts.
I think linux is very similar in this regard, part of what makes it so good, is being so familiar with it. Windows doesn’t let you do this, because it doesn’t want you to. Linux does, because you’re supposed to, and i would argue that telling people linux is a “turn key” solution is rather irresponsible when inevitably, they’ll want to do something weird or have to fix a weird problem which will require them to go digging around somewhere.
I also don’t think the basic concepts of linux are all that complicated, two weeks and a vm to install arch and you’ve got most of the foundational concepts in your head already.
i mean it depends on how you define common, common among the world populous? No, common among fabrication types? Yes.
there are only a few things that are common amongst the whole human population, and none of them are learned skills. (learned as in learned from the ground up, to be able to do that one specific thing I.E. socialization doesn’t count as it’s a fundamental aspect of humanity)