I think the previous iterations, it would only work for Apps where you signed up and created an account with your Apple ID. Individual apps didn't like this since it meant having to support Apple ID for login, so it never caught on. This sounds like it's basically just recognizing you're already signed in on other device so it signs you in with the same credentials. Maybe it will be more successful.
This week I spent 10 minutes logging on to Hulu on my Apple TV. Not sure why it logged out, but it just would not make it through the login process. Of course, my phone could log on no problem. So, while this doesn’t happen too often, it’s a great fix for the 4 or 5 times a year I have to logon. Nothing is worse than trying to get your tv working while sports are ticking away.
This is what I really want from the AppleTV, proper user space separation. If I login to Disney+ on my Mac, it remembers my user profile and goes straight to it. If I then log out of the Mac and one of the kids logs in and goes to Disney+, it goes directly to their profile. On AppleTV if we do the same thing they play what they want from the home screen and it plays from my Disney+ profile. It’s infuriating.
My cable provider offers support for the TV provider feature in iOS and tvOS.
Then there’s no reason to stay with Apple TV. It’s quite useless outside the Apple ecosystem.
It's already been relegated to the exercise room to watch yoga videos on. Main tv is Roku.
I think it's more likely a cap on concurrent logins... so OP/family/kids/etc probably signed into some threshold of devices and/or locations which triggered and LIFO algo to kick him off. It's their subtle way of deterring sharing.
It's going to be available in the upcoming versions of the OS (26), and developers have to know about in order to implement into their apps (that's how developer conferences work). If it's not implemented in a timely manner, it will not be Apples fault (it will be the app developers).
