The IR extender kit is for those that want to use an infrared remote and mount the device behind the TV. Vero 4K features a built in IR receiver, but this requires good line of sight (as is the nature of IR).
The kit is not a substitute for RF: but we understand that some people may want to use a universal remote control instead of having another remote.
USB ports are functionally the same in their current configuration but can be adapted for OTG, hence the different colour marking.
Sam