I get you can chromecast and that's fine but there really is no reason as the fire TV app can be sideloaded. It's literally a couple lines of code. Also, the Apple TV version has a 3 game at once feature which is frustrating when you have a Nvidia shield that could easily handle that. Watchespn app also has a 2 games at once but the ATV version doesn't. ATV is a great platform but it's frustrating at times when developers don't help us out
Honestly if it wasn't for the Nvidia shield, Google would've botched AndroidTV and it would've flopped.