Who isn't talking about capability? The claim was "Everyone should learn how to change the oil in their car, though.", not "Everyone should change the oil in their car, though."
The inability to change your oil is frightening on the same level as the inability to connect yourself to wifi. I don't give a shit if you get your oil changed at the shop, or if your work computer automagically connects to corporate wifi out of the box, but you should be able to do either yourself.
I just don't at all understand why you're frightened of me not knowing how to do something that I'm not interested in, almost surely never will have to do, and can always easily learn if either of these situations changes.
You learn the things you're interested in, the rest of us will each learn the things we're interested in.
You can be frightened about that, but it's frankly overbearing.
Pop open your glovebox; there is a nice picture book in there that explains with nice line-drawing illustrations how to change your oil. It is easier in every way than assembling an arbitrary Ikea chair. If following instructions from a picture book is too much for you, then I am frightened, mostly for your own safety.
Nobody is saying you have to figure out how do it in a sterile proctored testing environment with no books or computers. Hell, I still consult the grep manpages semi-regularly; knowing how to read documentation is a part of being able to do things. The ability to do things is a far lower bar than you are making it out to be. I don't believe you actually lack the ability to change your oil. Some people do, and they are frightening.
Pop open your glovebox; there is a nice picture book in there that explains with nice line-drawing illustrations how to change your oil.
That hasn't been a given for many years. My 1998 Passat and 2006 Jetta manuals contained no information for DIY oil changes, other than change intervals and suggested weights.
The inability to change your oil is frightening on the same level as the inability to connect yourself to wifi. I don't give a shit if you get your oil changed at the shop, or if your work computer automagically connects to corporate wifi out of the box, but you should be able to do either yourself.