The ability to make an object not reflect in other specific objects, like Vray. For example not wanting a bounce board to reflect in a window or mirror when using it to add more reflections to a chrome object. This feature has been in vray properties for as long as I can remember. I've asked for it many times and I'm not sure why its not an obvious missing feature already.
While this can still be discussed, bear in mind that Corona is focused on physical realism, whereas V-Ray is focused on allowing you to do anything and everything e.g. as needed in the VFX industry. This is why V-Ray has it, and we do not :)