I'm intrigued that the phrase is "capability to deliberately practice," as though that was itself a form of inborn talent--the patience or interest or focus required to do something well even when it isn't rewarding.

I'd have felt better if it was "determination for deliberate practice" or something like that.

Yeah, it is interesting that the author, even after reviewing these results, wants to attribute SOMETHING to the intangible, because creative success or failure simply can't be THAT dependent on our own actions, can it?

I've always wondered about this. Especially with math, so many people say they are just not wired to do math as if it is something you have to be born with. For me, I had to spend many hours practicing to get the feel for it, but I did.

I'm sure biology and life experience give us a certain aptitude or hinderance or level of interest in all these things (like learning a language is apparently so much easier if you start when you're a kid), but I agree. The areas at which I suck are consistently the ones that I haven't focused on.