I am sure you are an absolutely awesome skier, just as you proudly point out in your post. You may well be the Jordan Spieth of skiing for all I know, but I will just have to take your word for it.
My point, in the context of the topic of this thread, was that focusing on mastering one run (or one ski mountain) can give someone a false sense of how well they may be able to ski elsewhere in comparison. Witness skiers who have mastered all of the double black diamond runs at Mount Cow Pie back home in Iowa coming west to the Rockies thinking they can ski anything on the mountain. Or skiers who are experts on the ice on Mt. Glacier in Vermont coming to the PNW to ski Sierra cement. It is totally a different issue of whether one is a "good" skier or not. World class experts like Jordan Spieth (or you) can do well in their specialty anywhere they go, but most mortals in either sport in the real world are not at that elite level.
I'm sure any of my normal ski friends have no issues when going out west. I have skied a few of the steeper runs in the west the steepest is 59* and figured out after the first turn, hey this is just short radius turns. We've hiked to the bowls at Crested Butt when we spent a week there. Did that daily for that week, even hiked to the T bar when it was to windy for the lift other lift to take us there.
Granted I'm not talking cliff jumping, just expert terrain. I may be have to agree with your statement about skiers in the mid west with a hill with 3-500 ft of vert. But here in New England we get all the snow conditions, from blue ice to heavy Spring crud. We have big enough mt's with long enough trails to ski a few miles before you stop.
If your serious about your skiing, there isn't much you can't ski.