Lanks, you mentioned Jeff Bean as someone who can ski outside of aerials, and that he is who you've based your assumption that most aerialists are real skiers. Honestly, I think he's the exception, and not the rule.
Case in point: Veronika Bauer was a gymnast/trampoline medalist who transfered her acrobatic skills to aerials. And yet, she couldn't even skate to the take-off zone (she was taken there by snowmobile)! That was 1998. Since then she's been given enough skiing-related skills to get around the competition area. I can't say for sure whether she's added other parts of the mountain to her repertoire since.
The entire Chinese aerials program was drawn from their gymnastics group because of the ease in crossing over. And not one of them knew anything about speed adjustment on the in-run which is why their injury rate was so high. Now they're a force to be reckoned with, but they learned the hard way.
Let's not forget that back in the day, freestyle skiing consisted of people who did all 3 disciplines (moguls, aerials, and acro *ballet*). They were well-rounded skiers. Everything is so highly specialized now, I don't think the generalization holds up.
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Demo days allow all skiers to try different skis to find out which ones reward their brand of poor technique.
"Pleeease! If I get into Ski Canada, then I'll be able to get a sponsorship, then my parents won't make me finish school."
 - Marmot Basin local