Skiing is easy. Skiing well is not. Learning is easy, and it's just as easy to learn bad skiing as good skiing. If you want to learn to ski well, you must practice good skiing movements and tactics. To do that, you must either understand the difference, or (much easier) find a teacher who knows, and can see and teach, good skiing.
The great painter Degas once said (perhaps not an exact quote, but close), "Painting is easy if you don't know how."
It's easy to become a hack! If all you want is to get down the mountain, and you don't care how it feels, how it looks, how precise your control or efficient your movements, how tired you become, or how much stress you put on your body, just about any lousy old movements will do, as long as you do them well enough. The vast majority of recreational skiers exemplify this, at all levels--they learn bad skiing to start off, and then get better and better at bad skiing. They have fun. Many learn to "ski" just about everything. And they're often satisfied and happy with how they do it.
True experts--and those who will become experts--are never satisfied. They may be (and should be) proud of how they ski, but they are never satisfied. They strive to do it better, to eke out that last iota of performance, precision, control, efficiency, awareness, smoothness, sensitivity, consistency, or speed. Racers--at least the best ones--will go to extraordinary lengths to slice off another thousandth of a second in a turn, or a run, which can mean winning or losing. They may not understand the details or care about the subtleties and nuances, but they rely on coaches who do.
So the answer to the original question is, "it depends." Which do you want? Do you want to get good at good skiing or bad skiing? If you care, it matters!
Samurai--I disagree that modern skis make it easier to ski well. I'd argue that they make it easier to ski poorly! It is true that you can do a lot more with a lot less skill than before. But the skis don't make us any more skillful. It's true that they bring "carving," powder, and steeps--once the exclusive domain of experts--to the intermediate skier. But they won't turn hacks into experts.