I wouldn't call your machete a typical rocker, maybe a flat rocker/flat camber at most and learning about snowboarding is not finding the joy ride that swallow one's newbie skill mistake and be as tolerate as possible, in fact it is about consistently correcting your mistake and be able to identify them. Therefore in this way you will learn more on a camber board than a rocker board.
Totally agree that it's bad for skill to have a board that's too forgiving. Equally it is not very fun if you are spending your entire day catching edges and falling over because the board is too unforgiving. The ideal is somewhere in between.
Now you are on your sweepstake of the curve, but wait until you hit your first plateau and wonder why you can't progress as fast as you wanted, and maybe step back and take a look at your technique. If you think you really mastered all basic stuffs, try to rent a burton custom X and try it out on the entire mountain and then let me know if my suggestions make sense or not.
I'm not pretending to have "mastered" anything yet and I am super-focused on improving my skills. I'm 31 and only started riding two years ago, so believe me I am pretty focused on progressing as quickly as possible because I'm making up for lost time. One thing I love about the Machete is that when I screw up, I can always point to something in my technique that was at fault and try to correct it. I never feel like it was the board's fault. So it's ideal for developing my skills. And it's fun to ride.
If I get to a point where I plateau, I'd rather invest in a decent private lesson to try and iron out my technique rather than go rent a different camber board just for the hell of it, which might not necessarily identify the cause of the problem at all.