Comment by gundmc

You and the parent poster seem to be conflating the ideas of:

- Does not have the requisite skills and experiences to do X successfully

- Inherently does not have the capacity to do X

I think the former is a reasonable standard to apply in this context. I'd definitely say I would be bad if I tried to play the guitar, but I'm not inherently incapable of doing it. It's just not very useful to say "I could be good at it if I put 1000 hours of practice in."