I am calling it a feature because there are only 2 things which really changed.The headphone jack and the antenna bands.If you disregard both its just an iPhone 6SE.
I think it's pretty naive to say that those are the only thing that have changed considering we have no announcement on the product or it's features yet. And I think we really need to stop focusing so much on the casing as there is really only so much the phone is going to change over the years (new materials, thinner, etc.). For the iPhone 7, there is rumored to be improved audio, and improved screen, touch sensitive home button (which I am not sure of the benefits, but apple could surprise with some software improvements), camera improvements, etc. All of which are real world beneficial upgrades to a phone, not just hey look, it's in a new case.