Pedantic
Legend
You're using a very specific, and I'd argue very videogamey model of "skill" here. I'm not sure that being able to confidently replicate the same inputs or to run the same gauntlet is the most effective means of evaluating a general ability, nor do I think "skill" in the sense you're using it here is particularly important to gameplay.I don't think it really matters whether it's over 9000 or just a couple of points beyond the guidelines. They are still unenforceable and, thus, completely meaningless.
The fundamental issue doesn't go anywhere: GM has to pull punches and can't create the most brutal adversity she can, so overcoming this adversity matters jack. It's completely arbitrary and isn't set in stone to verify and retry.
Shifting to board games for a second, I think a commitment to trying to win is far more important than actual success at doing so. I play some kind of no/low randomness economic euro with roughly the same people most weekends, and our victories are not evenly distributed, running closer to something like E:40%, N:20%, C:30%, and me at 10%. There's no real way to know how generally effective we are at those games (though I would lay heavy odds on any of us over a new or significantly less experienced player), and if we are improving at them, we're doing so in close enough parity that our general win rates stay about the same.
The enjoyment of the experience comes from the novel interaction of mechanics producing new and interesting board states we have to try and puzzle through.