The coaching I've had in recent years (mostly from professional freeskiers, but some from formal ski instructors) is the opposite of the "feet together to create a platform" school. The only time they advise that is if you're trying to stay on top of breakable crust, if you're trying to ski deep powder on skinny skis, or if you're zipperlining bumps.
For powder, crud, or anything else - if you are on fat skis, your feet should be shoulder width apart. It gives you much better balance and stability, especially if you're moving fast. And your legs should be working independently for balance - when you hit uneven patches of crud, one leg might be going up to absorb while the other is going down. If you're in nice smooth powder, obviously that isn't necessary, but the point is that they should be ready to move independently as necessary, not locked together in a platform (which makes you stiff).
Not that you can't ski powder with old school technique (obviously), but getting your feet apart makes you more balanced and you can ski faster and in better control. Every clinic I've been to in the last 5 years has been a chorus of "FEET APART!", especially to the people who learned to ski powder a long time ago.
For powder, crud, or anything else - if you are on fat skis, your feet should be shoulder width apart. It gives you much better balance and stability, especially if you're moving fast. And your legs should be working independently for balance - when you hit uneven patches of crud, one leg might be going up to absorb while the other is going down. If you're in nice smooth powder, obviously that isn't necessary, but the point is that they should be ready to move independently as necessary, not locked together in a platform (which makes you stiff).
Not that you can't ski powder with old school technique (obviously), but getting your feet apart makes you more balanced and you can ski faster and in better control. Every clinic I've been to in the last 5 years has been a chorus of "FEET APART!", especially to the people who learned to ski powder a long time ago.