Only if you have no clue what version of tvOS you are currently running. Yes the title stipulated two beta versions of tvOS and not the current consumer version... I fail to see how that is click bait.
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Why? If it means i can NOW access individual tv networks from my apple TV / Phone this means everything to me.
Sorry, but you are not the person that posted the question, so not the person I was addressing. In fact, you and I are agreeing!
The person that I was responding to did not understand what SSO would do since he ONLY uses SlingTV. And my response is 100% accurate in that if you ONLY care to use Sling, then you won't get much if any benefit from SSO. To give you context, the original question I responded to was "I really don't understand the point of this. I have SlingTV so I go into the app and sign in. Done. Why do I need to sign in at the System preferences level?"
For those of us that use multiple apps, like you and I for sure, SSO will be super-impactful to our experience.