JT said regarding flying: one day I didn't feel just right so I climbed back down. He couldn't really pin down what or why he was feeling like he did, he just did, and didn't second guess his intuition. (Tons of respect for that.)
So if you're not sober, how can you make those subtle calls?
This year, when skiing is epic and real danger exists I will ski sober. Why not? I've survived about all the dumb choices I have any right to expect.