Rockered snowboreds exist.
But the reason you don't see ridiculous Surface-style rockered boreds is length. Terr isn't enough tip and tail to get those goofy rocker profile. Instead of 80 or 90cms in front, you've got 30 or 40.
It doesn't matter if you're a King or a lowly street sweeper, sooner or later you'll dance with the Reaper.