It has nothing to do with any of them being experts, and more to do with the fact I spoke to a lot of people about this stuff and they all said 'find something you enjoy riding rather than worrying too much about a specific camber'. Some knew their shit, some probably didn't, but no-one I spoke to said anything to suggest that I'd necessarily develop better technique riding camber.
I originally thought that I should get a camber board for that exact reason you said. I instead bought a Ride Machete (rocker), because it seemed to suit my style of riding and a lot of people had good things to say about it. I personally think I am learning stuff a lot quicker on this board and enjoying my riding a lot more than when I was on rental boards, all of which were camber (at least the ones I rode). (that could equally be because most rental boards are pretty shitty though)
It makes sense really. If you have a board you enjoy riding, you can spend a lot more time thinking about developing your skills, because you don't have to worry about getting shitty and frustrated because the board didn't handle like you wanted/expected it to in a particular situation.
With all the hybrid boards around nowadays I think it makes a lot more sense to think about whether the board will suit your style of riding rather than getting too hung up on the exact camber of the board.
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.
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.
btw I started on a shitty burton v-rocker board and jump onto a flat camber board. I really learn the hard way about using precise technique for different terrain and if I can start all over again, i'd definitely stick to camber boards.