Chromecast doesn't have its own UI or authentication, it just uses the authentication of the device the stream was started from (being able to delegate that is

Chromecast doesn't have its own UI or authentication, it just uses the authentication of the device the stream was started from (being able to delegate that is a requirement for chromecast support). So it solves the same issue but in a very different way. Its a pretty clever solution but requiring all interaction with your tv to happen through another computing device can get annoying.