Yes, I can ski on ice also but is it fun? If the conditions are a problem and you are fighting to stay alive it no longer is fun skiing. It is just a struggle.Ice no problem, I can ski . Fog on the other hand is a mind game, know you can....its no problem, fear what you can't see (even just a little)....big problem.
These (and first difficult runs) bring back one thought I try and live by......
If in doubt, attack, if it kills you it was the wrong decision.
Still here and in one piece going strong.
All these difficult runs are caused by fear of not being able to. Have confidence in your skills let you overcome and conquer (not always pretty).