Series X: Any advantage to running MCC at 60hz over 120hz?

Does HDR still work at 120hz and 4k?

Is graphical fidelity higher or the same in both 60hz and 120hz mode?

Any benefit at all to running the games in 60hz?

I’m like 99% the tick rate for all games in the collection is 60 or less. This means that even if your FPS is 120 the input can only be received every 1/60 a second ignoring input lag. There is no advantage to playing over 60Hz. I believe HDR support @120Hz entirely depends on your display setup, but the MCC should be able to handle it.