I've heard that before, and even then I thought that was absolutely rediculous. It puts more of a constraint on what can be done, and essentially, forces the runs to be less that what they can be. If there is an emphasis on style, then that should appear on all hits, instead of requiring a low-spin hit to demonstrate that. If skiing went that route, it would be a sad day. Spinning every hit just makes everything so damn difficult.
Oh, and not to mention skiers do go bigger. This is a crude comparison because it is just comparing two riders, and just captured quickly from online videos, but here is Fisher (snowboard pipe gold) and dumont (ski pipe silver) and their respective first hits (not to say the rest of the run wasnt sick). No fucking comparison. Snowboarding can keep their straight air requisites.