What sort of revelation is this suppose to be? The older the console, the less you'll have backwards compatibility with. The newer the console, the more you can go back with backwards compatibility. Besides, his conclusion pretty much wraps it up from 15:11. Paraphrased: In the end, it's not that big of a deal, and not a whole lot of people really care.
It's only supposed to spark conversation.
Back in 2012 I did think about BC being limited by the controls. Gamepads would be harder to make backwards compatible, specially when a company wants to innovate that part of the hardware. Still as we have seen this generation, said limitations can be overcome through software.