You could say that. You might be right. Then again, if the designer was focusing strictly on webcam applications, he might be inclined to limit the rotation mostly to the front plane of the device... or thereabout.

As for megapixels, back to that hypothetical designer: the webcam is likely to be cheap, to keep cost down, and not designed for anything more than video cam use where super high resolution would be impractical.

I'd offer to bet you on which one of us is closer to reality, but that wouldn't be fair.