Please stop trashing poor Round Robin. It's not his fault.
While I completely agree that his current use in regular ATP tournaments is very poor, there's nothing wrong with him in general.
Round Robin has his place in the Masters Cup, and also in Club tournaments around the world. He guarantees that players get to play several matches instead of just one which is a good thing. And he reduces the luck factor in draws so that the final positions in the tournaments are often more accurate than in Single Elimination events.
But he is just not that good for groups of just three players, and especially when only one player advances. It creates too many problems.
So please cut Round Robin some slack. He has been abused by the ATP so you can't blame him for causing all this trouble.