Submit a patch with behavior B with the intent of delivering behavior A. Maintainer accepts it on the premise that behavior B is a good change. Since iti s self documenting, it correctly documents the wrong thing. You've now made a patch that you don't understand.
> Yes well thats vaguely the shape of the point I was making
So, your point is that something is bad because it's /possible/ everyone involved with it could be terrible at their jobs? If that's your point, then I can't imagine why you'd try to make it, because it applies to nearly everything in the universe of "doing things".
Similar to your original comment of "You've now made a patch that you don't understand.", you've now made a point that you don't understand.