I will actually go one step farther and say from experience as an instructor, that a rocker board is an ideal board for a student to learn on. Now, that does NOT mean that a rocker board is a "beginner board" The performance ability of rockers makes them a superior board for beginners and advanced riders alike.
I used to hold this outdated, opinion that a rocker allows bad habits to develop. It does not! All of our rental boards are rocker hybrid and the student learns the exact, identical techniques to make turns and position their bodies for the best, most efficient riding. Anyone who thinks that a rocker make you invincible to sloppy riding has never had a violent edge catch on a rocker...I just had one the other night in a switch carving clinic...
Every bad thing that happens as a result of poor riding habits on a cambered board, happens on a rocker too if the rider does not use good or "proper" technique.
What rocker does do though is it helps reduce a lot of slams from poor technique in new riders. In any first time class of say 10 people. we feel lucky if 3 of them come back for either another lesson or become snowboarders in general. The number one complaint new riders have is the pain from falling their first few days. If a rocker board makes learning, safer, less frustrating and more fun, then it serving the snowboarding industry in ways that are hard to calculate.
I absolutely support having the new rider learning on a rocker for reasons of fun, safety and ease of progression. Bad habits will show up on any board and decent instruction will detect that and correct it early on regardless of the board being ridden so why not make it easier on the student? I think a rider should learn on a rocker and when they become a high intermediate ride a little bit on a camber to refine their skills farther.
From a personal standpoint, I will take a rocker hybrid over a camber in every condition except hard carving on very firm or icy conditions. Even having said that, I carved the shit out the Angus on bullet proof all week. The Amptech rocker/camber/rocker has become may favorite combination of rocker and camber for all conditions that I deal with in the PNW.
In this discussion / argument / shitstorm of a thread about what is better, I did not see much mention about what I would consider the MOST important aspect of snowboarding and that is FUN. Regardless of the techno-babble and geek-speak, Rocker boards are just plain FUN in and out of the park....