I don't see how their choice to use Lithium polymer batteries instead of 18650 cells refutes or even directly relates to my point. Are we to consider the use of square (cuboid) objects in a square space some sort of heretofore unseen brilliance?
No the point is that apple have provided users with something that every user is going to want very long battery life) over something that very if any would make use of (express slot).
Er, but the two things are totally unrelated. It's not like they took out the express slot to increase battery life.
It isn't engineering laziness either though... they took it out and replaced it with something else, the SD slot. Certainly I don't know if the case they made for it (based on Express slot usage) is valid or not but as it would have actually taken effort to do and would have been less effort to leave it alone then it's hardly lazy.
I know there's no link between the battery life and removal of the express slot but rather was trying to make the point that if they were being lazy they wouldn't on innovated in other areas.