Pass through system? what about completely replacing your DVR.

I just read on the xbox website that the way you watch tv is via a pass through system which means you still need your original box top setup. The you have and hdmi from the original DVR to the xbox1. what about using the X1 as replacement for a secondary reciver that i have in my room. I have the AT&T UVERSE service. I would love it if i could just an app for tv rather than a pass through like most devices like the logitec RVue ( or something)