You might be right. Personally it doesn’t seem that way to me, but ultimately people end up wherever they end up, and it’s often hard to disentangle why.

One thing that does seem different in those skills that you mentioned, is that drawing and singing are creative/artistic, which means that there’s no “correct” outcome. If you fuck up fixing a car, it doesn’t work, and you have the immediate and direct feedback that you’ve done it wrong.

With drawing or singing, if you do it wrong, you only really have your self-image and personal aesthetics to answer to. You can get really good and still hate everything you do, and there’s no way someone can show you that you’re objectively wrong, because it’s a taste thing. OTOH you can do it technically “badly” forever, but like what you do, and if you stick with it enough, then maybe you just made a new style of art.