I hear what you’re saying, but I honestly think it was just motivation and maturity. I gave you two examples, but there were a number of things that he got very frustrated about when they didn’t come easily. Some were school subjects, so he didn’t have a choice and had to keep pushing at it, and would eventually get there. In fact, he didn’t learn those things more slowly than anyone else, it was just that he was used to getting things instantly.

There’s zero doubt in my mind that he would enjoy the guitar, but he wasn’t mature enough to get past the initial frustration at the time.