For those confused why their TV is not getting the update, this update only works on Sony TVs with the X1 Ultimate chipset. That's why last year's A9F is getting it but not this year's A8G.
At any rate, I agree with those above. Just use an Apple TV (or any external streaming box) over the built in smart OS. I use an Apple TV with my A9F and a Fire TV 4K with my LG B6 and would never go back to the built in apps. They lack features and are not supported well. Not to mention the security risks of storing all of your login credentials on it.
Don't they have weaker processors though?
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How do you not see how a dedicated hardware device would be more capable than the menu of your display?
The XF90/X9000f has the same X1 Ultimate chipset
https://www.sony.co.uk/electronics/televisions/xf9005-series