where did you get that info that its the same size as the air 13? it doesn't make much sense to me as its just slightly smaller then the 2015 15 inch pro model ,
you can see size comparison between those 2 models on top of each other in this video , 2:25
appleinsider I believe had a video review showing an air on top of it
13" Air:
Thick = 0.68
Width = 12.8
Depth = 8.94
Weight = 3lbs
15" 2016:
Thick: 0.61
Width: 13.75 (~1")
Depth: 9.48 (~0.5")
Weight: 4lbs (1 lb)
thats pretty damn close! I think its worth the extra screen. And to think about it further, I always hated that sharp edge of the tapered design if I was lazing on the sofa and resting the weight of the open clamshell on my stomach lol.