Which is why I force the aiming roll.
But judging distance you can see is far easier than judging distance you can't see. Easy experiment: if you have access to a large-ish dark room with some open space in it (a garage with no cars in it, for example), lay a hula hoop down on one side of the room and try to land a bean bag in it from the other side. Then try again with the lights off, or while wearing a blindfold.
Is Blind Sight the same as a bat's echolocation? If yes, it can certainly be used for targeting.