The issue is when connecting with the app, and attempting to enter a password, the app freezes, and then force quits. Making it impossible to actually enter a password to connect the TV to my wireless network. Luckily, the WPS option works, even though it's a bit hidden.
I've tried using the app with a Nexus 6, Nexus 6P and a Pixel! There is also no on screen keyboard for the Youtube app. The only way you can search is with voice, which is not the most ideal thing to do all the time.
As of the most recent update to the TV in January, casting has become rather intermittent. Generally I must hard restart the TV before my laptop or a my phone can properly connect to the TV. The Netflix app also randomly starts and takes over control of the TV even while in the middle of running another application.
I love my Android TV, but it's a bit absurd. I now have a Chromecast Ultra connect to my TV that I use most of the time, it also allows the Google Home to use the TV.