As for kids, I agree with you that the majority of them can potentially be good at almost every field. But as for adults, I’m not so sure. Most of us become way too rigid as we age, learning capability and more importantly motivation becomes way lowered. So someone who had trouble with basic algebra (at the time mostly due to a bad teacher/experience with math) will not generally be able to overcome his/her identity of “being bad at math”. Of course, there are exceptions.

The majority of us can improve in any area. Some brains are hard wired for programming others for say music.

A programmer can make a song. A musician can make a program. I'm sure you could train those kids to sing as well. I'm sure you could train those kids to play basketball.

You wouldn't be able to train them enough to make any professional league.

Programming is genetic. Recently I met my birthparents and I discovered the whole family are programmers. I thought I came up with the idea myself I pushed myself through school. No one in my highschool did programming or elemetry school. I thought I determined my own choices.. I was proud of the unique path.. then I met the birthparents and realized how predetermined everything is.

I do think it is more about the way you explain something than about the actual topic. You can explain the same topic in such a way that it works for people who can visualize things, for people who like abstract concepts, for people where it is about social relationships etc.

Good educators will always target multiple of those patterns. Bad educators always target the same pattern and will therefore only have auccess with the same kind of person.

I am currently teaching electronics and programming to artists who quite uniformly hated math and physics in school, and it kinda works. You just cannot teach it in the way they would teach it to a STEM student.