After I wrote this, I thought of the Nvidia Shield, but that device is much more than just a streamer of Netflix and content apps. The GeForce Now experience is what the shields were targeted for. I had one, and thought it worked pretty good on a wired connection for streaming my PC games to my TV but sold it as my performance on a Steam Link was about the same and much cheaper.
People who buy the Shield usually want it for the ability to stream games from their computer to the TV and using the Android based streaming apps is just a value add.
Unless Apple plans to do a lot more with the ATV, a bump to A12X would benefit almost no one in current use cases. Apple is also no where near to being a competitor for gaming consoles for more reasons than just hardware in the next couple of years.
Well they have a version of the Shield targeted more for TV use as the priority, and I see it discussed widely on forums catering to TV, not gaming, so I'll disagree that its not for that. Its usually listed as the best box for Android TV and will possibly lose that title when the rumored Google entry is revealed, which is supposed to have been tightly integrated with YouTube TV. But the more expensive Shield is definitely going after a different audience.