A professional mechanic certainly not, someone who know the car enough to understand why there is a strange noise from the beaks and a kind of hiss from the belt (in an ICE) yes. Not differently from why I want any adult know enough about drains, sewers to understand why not throwing pads in the WC or why I want anyone knowing enough about food to understand why we cook certain foods and we eat others raw.
It's a classic concept: the general and generic culture ANY Citizen should possess, learnt back at school. Without that we are all robots, beasts pastured by the shepherd unable to comprehend why we do something instead of something else and so unable to decide peers between peers in a Democracy. Anyone have his/her own specialization, but we must still know a bit of anything at a high level, but still enough to understand if something could be logic/true or not.
A society that work, evolve positively is formed of Citizens not meat-based robot able only to do 1/4 turn of a wrench. People who crack their windshield in the winter, defrosting it with boiling water, others left without fuel at sea in the summer and so on should not be a thing. A child is a child, an adult MUST BE an adult, a Citizen. It's about time to say "if you have to use a computer, a desktop, to work you MUST know it enough, not being just able to click around not even knowing what is a file". In the west world due to such evolution we are unable to do almost anything these days, we have lost much of our best scientific and industrial power because of such idea.