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Why even care or bother about any of this? Doesn’t everyone just carry a laptop around for traveling and can watch whatever the hell they want?
There’s watching Dune on a 15” display, and there’s watching Dune on a 70” 4K display.

Seems a no-brainer to me…
 
Not sure about this specifically but I had to login to the Apple TV app on my LG tv yesterday and it showed a QR code which I scanned with my iPhone and it activated the app.
I like that, it's so much easy and my phone knows the passwords to autolog me in and I don't have to let my password out in the wild. I can then log out that streaming device when I leave.

Or better yet, when activating I've got a checkbox for "I only want this device activated for a week/day/etc." or something like that (and it wouldn't cause a problem for some services that pay attention to where you are geographically as they'd know it was for a fixed time).
 
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