That's one way to look at it, but another is that the wedge christie exhibits flaws in your default movement patterns that affect other elements in your skiing. I've not seen video of @karlo's normal skiing, but I suspect that many of the movement patterns that are exhibited in his wedge christie are present there as well. The release of the ski through inclination rather than ankle and lower leg tipping, upper body rotation, and shoving the skis away from him. The wedge christie is a painful task to learn largely because it requires you to fix other elements of your skiing.By the way, I think this is all pretty pointless since we don't teach students to do a perfect wedge christie. But learning to do a wedge-christy by the book does show the examiners that you are willing to go through weeping and gnashing of teeth for their approval. They will reward you if you can do it.
Of course, one can be a perfectly functional skier without (more) ideal technique. One can even teach lower levels of skiing without more ideal technique. The blended tasks, of which the wedge christie is one, do show whether you can take the 3 skills and 5 fundamentals and blend them to achieve more ski performance. So, learning to do a passing wedge christie, while it might not have much application per se in ski instruction, does help on the path to learning movement patterns that result in higher degrees of ski performance. But the real question is why are you doing this at all? Is it because you want to teach skiing at the highest levels? Is it because you want to become a better skier? Or is it because you want a free pass and a bunch of folk to hang out with?
There may be easier ways that are more fun to become a better skier than going through the certification process. And those ways might even be quicker as you don't have to fill your brain with a bunch of baggage that might not matter to you (like MA, teaching, etc.).
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