I wouldn't really call the Apple TV a secondary Apple accessory. The only thing another Apple device brings to the table is Airplay (and I guess slightly better

I wouldn't really call the Apple TV a secondary Apple accessory. The only thing another Apple device brings to the table is Airplay (and I guess slightly better keyboard input) hardly necessary when all the streaming services and games can be used with the remote or a controller. You can still buy iTunes videos on a Windows PC to watch on the Apple TV too. It's basically a fancy Roku or FireTV neither of which require another device.