The feature you describe does not make the BB worthless. It just means you have to use the indicator for something different than what you want to use it for. It's like complaining that a screwdriver is a worthless tool because it doesn't work on your nails, or that a fork is the worst culinary utensil ever invented because you can't consume your soup with it. The black square bishop does not help a chess player at all on the white squares, but that does not make it useless. Different tools offer different clues or edges, and you have find ways to make them work together, sometimes in ways the inventors or discoverers of the tools never imagined.
It’s terrible, it’s just a mess. It’s a horrible excuse for an indicator! I don’t know how that mr Bollinger got away with it