Why does mogul skiing make you better skier compared to the other competitive disciplines of racing and freestyle? Well, first off, realize that I certainly do have a bias (and I may catch a little flack for this, too). In racing, you learn to carve your ski and go fast while maintaining control. In the other disciplines of freestyle (aerials, halfpipe, slopestyle, etc.) you will become a great jumper but that is it. In mogul skiing, you will learn to turn using multiple turn concepts. You start by learning to ski the bumps using sliding turns but then as you progress, you will begin to carve more and more in the bumps like a racer does in slalom course (check out Toby Dawson and Luke Westerlund for the most complex and technically clean carving turns in the world; Hannah Kearney and Michelle Roark for sliding turns). As an all around skier, I think it is important to have both of these turns in your bag of tricks for skiing steep and technical terrain.
In mogul skiing, every course has two jumps. You have to be able to ski the bumps fast, get clean entry to the air, do your trick, and have a clean landing back in the moguls, then do it all one more time. In the other disciplines of freestyle, you are given a smooth take-off with a long consistent landing. You learn to jump really well but you don't get the same skills you do jumping in the moguls and having to land without so much as a bobble of the head or hands. When you can land a jump going 10m/s and take on that first mogul without even thinking about it, you can take on just about anything any mountain will throw at you.
I think the biggest reason so many of the best skiers come out of freestyle is that mogul skiing requires you to have the full package. You have to be a good skier in adverse conditions, it teaches you really good skills in recovery from mistakes, it makes you great jumper, and even more importantly, a great lander
. Check out any World Cup or Olympic footage and I think you will see exactly what I mean.
If this doesn't get you excited, I don't know what will: