Another possible designation of the expert level would be the state of unconscious competence.
This refers to the 4 levels of mastery in any field: 1.Unconscious incompetence: you have no idea how bad you are. In ski, probably the folks bombing down slopes in the back seat out of control, thinking they’re great skiers; 2. Conscious incompetence: the start of progress. You know what you don’t know. Good place to be, and the area of very satisfying progress; 3. Conscious competence: you know what you’re doing; 4. Unconscious competence: this is very rare, and harder to explain. You’re really good, so good in fact, that you no longer realize how far ahead you are. Think of Mikaela’s baffled look at the end of some runs, when she looks at the clock and can’t understand that it says she’s ahead by more than a second. Paul McCartney saying something like “and then John and I put this one song together one day”, referring to an iconic piece of musical history. Neil Armstrong talking about his mission as if it’s changing a light bulb and seeming not to understand the level of complexity any longer. Yes, these are bizarre juxtapositions, it’s just what came to me as I’m free forming here. Most never achieve that level.
I guess the last would be way too high a bar in amateur settings, but perhaps conscious competence would be the least required level - and it takes external confirmation.