?? As others have said, it is often very important (at least when working in a collaborative manner on real-world complex code bases) to work out who added cod

?? As others have said, it is often very important (at least when working in a collaborative manner on real-world complex code bases) to work out who added code and more importantly why it either exists or was written that way. More likely than not (assuming it's a fairly high-quality code base) there's an edge case somewhere that it's dealing with. Bisecting to the revision before it broke doesn't tell you anything about this. Ideally, there should be loads of comments too, but then, that doesn't happen nearly as often as it should in the real world...