Right, I didn’t say anything about the physical dimensions of the devices. The length and width have to be the same to maintain compatibility with the iPad Pro accessories.No, they need to keep the width and height the same for case and keyboard compatibility. You'll note that the 11" Pro and 10.9" Air are EXACTLY the same for width and height. Depth is slightly different, but that is less important.
So, once they've decided to keep those dimensions the same they'll stuff whatever screen that will fit there with existing technology at a decent price and factoring in other technology restraints that may be a factor (like possibly the thickness of Touch ID).
What I was talking about was screen dimensions, which are indeed different per Apple’s product specs. I was making 2 points:
- The difference in screen size has no impact on usability. A difference of 784 pixels is basically nothing on a display with over 3.8 million pixels. Thus, the choice to put a 10.9” display in the Air seems like a rather arbitrary choice driven by marketing rather than any technical constraints. It is possible the TouchID sensor drove this difference in screen size, but we won’t know that until iFixit gets their hands on one for a teardown.
- Quite a few of the early rumors pointed to a 10.8” display on the Air. I was speculating that Apple might have originally intended to go with that size. However, since the physical dimensions of the Air chassis are the same as those of the Pro, that would have led to really thick bezels on the Air. That would have undermined Apple’s “all screen design“ claim, which led to the 10.9” size as a (somewhat odd) compromise.