the idea behind this design is to try to manage the hot spots between the cups, found in the cascade,
the jet would strike the wall of the cup creating a first impinging effect less efficient that the cascade one (but on a thicker copper height), on an other hand the velocity of the water would probably less affected by stricking the oblique wall, allowing a more efficient second effect.
The first impinging effect would be on the top of the potential hot spot...
the evacuation of the water from the cup would probably be easier ...
maybe a kind of washing machine effect ? (the european washing machines...) ??
this is more some kind of intuitive feeling that theory, but i would be curious to have the opinion of the theorical coolers on this point