If you could Connect any video device to your TV through Roku with an HDMI input passthrough port THEN ANY TV WOULD BE A ROKU TV.
The Roku interface is superior by far to any so called smart TV. Having to leave Roku to get into the setting on your TV to switch devices SUCKS.
Add an HDMI input or 2 to a Roku device that you can then select to watch from inside the Roku interface is the only way to have your cable and cut it it too. It makes every TV into a Roku TV.
PLEASE make this a future model of SUPER Roku!