But to that though, while luck is an abstract concept, skill isen't.

I am a short, heavyset guy. I am not that physically strong, but I am mentally strong. I love reading and puzzle solving and I know I can do well on Survivor if I ever get on the show, mentally at least. But I won't win challenges if they involve strength.

So I might need some luck to survive that show, but my skills will help me in my survival. Skill is a concrete thing. You can build on them, lose them, or be outclassed by someone with them, but it doesn't mean you will always win with them.