From the pictures it looks like the 2015 had an armrest in the backseat don't know if they removed the armrest for the hk stereo subs just deleted it for 2016
I completely agree, it's not a huge deal. But keep in mind, the car has 4 doors so it's mean for passengers in the back. I can understand a cheap car wouldn't have it but you want people in the back of a 70k car to hold their drinks... That's an inconvenience. Especially when they had the feature available before.