I'm perpetually wondering about this. As I do a lot of maintenance myself (in the house and on my bicycles) and as I derive satisfaction from it I understand what you're saying. It does feel liberating to have agency in these matters!

On the other hand these jobs do take space in my life and in my mind. It is questionable whether we should "force" people to do simple car maintenance. Our society runs on division of labour and everybody places their cutover to experts somewhere else. You say they could benefit a lot from gaining some mechanical understanding of their car's operation. And I feel the same. But they may wonder why they should learn a skill that takes time away from other things important to them.

Sure I may question how they spend their time. But now we've moved away from how knowing basic maintenance is good for you to a more general outlook on life. Watching a tutorial will improve one's future life. But we can't say that watching a car maintenance tutorial will be the right thing. Maybe it's a tutorial on Excel? Which would be more in line with the topic of the article anyway.

So I agree with you in general but not in specifics :-)