We prefer to use our Roku boxes rather than the "APP" that might be on
the X1 service menu unless a specific streaming channel is part of our
contract package. Even then, some of those channels on X1 service menu
let you use a set top box by enabling a link to the bulk account when
you first sign in on the set top box. We never sign out of any Roku
channel where we've logged in. When we're through watching that
channel, we hit the home button on the Roku remote and either go to a
different Roku channel or change the input selection back to the cable
box. That way, we never have to log back in. When we can watch a
streaming service either on the Roku or as a menu choice on X1, we find
that image quality is higher on the Roku. (Perhaps the MOCA signal is
more highly compressed than the wifi-transmitted signal used by the Roku.)
Our condo's bulk contract with Comcast provides unlimited wifi so I have
no idea if the Roku continues to use wifi bandwidth for those logged in
channels. In a way, I doubt it because many of the Roku channels don't
require login and Roku would go out of business if everyone with a Roku
box who are on metered wifi ran up huge bills. My understanding is that
the Roku goes "to sleep" after a certain length of time without a remote
button press but wakes up once/day to check for software updates.