Rider's Choice is still plenty stiff, the c2 is not as forgiving as just btx or rocker - flat - rocker profile, and the magne is not everyone's cuppa tea too (I like it, btw).
Sure, I also learned on a camber board, with mountaineering boots + strap bindings because that's what I could find. But I was lucky to learn in deep powder, so it really didn't matter that much. Plus I had skated for years before this.
Bottom line: there are many more suitable beginner boards, but it doesn't mean that it's impossible to learn on the RC