I'm still using my gen 3 ATV which I have had for the past 6 years. My tv is about to turn 10 years old and also still works great and I won't upgrade it until it dies. I don't play games. My question is what would I gain if I upgraded to the new ATV 4K? Is there any feature that makes it worth the upgrade in your opinion or am I better off using the gen 3 until it dies or I upgrade my tv?