I'm fairly sure he meant an entire shoot (months) of working with a camera system that was cumbersome to his style of shooting would have "been a disaster". While that may be "ego", it's in no way disproportionate to how any other director would react if presented with the same situation. Directors have egos, Bay shouldn't be faulted for that in this case. And I agree with you that it's an ego boost for Bay to acknowledge that he's pushing the boundaries of 3D filming beyond anything achieved before. But rather than rip him for it, I'm more interested in being pleased that that's being done on a Transformers movie, and dying to see the end result for myself. And while I don't have first hand knowledge of the 3D camera system, I think it's a safe guess to assume that changing out the lens on one of those cameras might be more time-consuming that on a standard film camera. In addition, you also have to understand that the rigging system used is vastly different. Cameras have to move further and faster outdoors than they do indoors, so I'm sure some of the difficulty was figuring out how to come up with rigs for these extremely expensive cameras to accomplish the movement they needed to... Bay's "train them better" was obviously a reference to the camera operators understanding what was needed from the cameras, and not teaching them how to use the cameras.