I wish the Siri button was customizable. I rarely use it because of how Siri is currently. It would have been better if it could be like the Action Button on the new iPhone where you can open certain apps or toggle some settings.

Great review overall! I love my Apple TV 4K for these same reason that you mentioned. The tvOS experience is really great and I really hope they work on the Game Center experience and turn it into a proper gaming console.