the will to learn about the topic

I think this is the bigger issue, to be honest. Like your example of environmental variables, it's not a complicated concept, but when a guide says to set the variable for Editor rather than a context menu asking you to choose the default program to open this type of file in the future, all of a sudden, people lose their minds about how complicated it is.

Comparing uncloging -manually pushing and pull a bar- or chaning a light -turn left, change, then right- or a breaker -literally just pulling a tab up- are WAY simpler actions. Yes, running apt upgrade is easy, but how you know is all well? That it work? + if I run apt update everyday I see almost no diference in my system, why should I even do something like that

These examples don't make sense to me as a point against using the terminal, especially since GUI package managers are a thing these days. Many upgrades are under the hood, so to speak, and don't produce visible changes for most users, and this applies just as much to other operating systems as it does to Linux. When Windows finishes upgrading and reboots, or Chrome tells a user updates are available, and they restart it, how do they know all is good? For the most part, they take it as a given that all is good as long as there's no new, undesired behavior that starts after the upgrade.

Just because I haven't been exploited by a security vulnerability or encountered a particular bug is no reason to remain on a version of my OS or programs that is still liable to either of them. That's just a bizarre argument against staying up to date.