But my point is, for them it wasn't a problem, because they weren't going to acknowledge the other network's shows anyway. So that left them a clean slate to build their world however they wanted. The issue of whether or not they should deal with the Arrowverse not dealing with Superman was never going to come up. Even before they got to the point of thinking about Superman, the Arrowverse would have been out of the picture. Supergirl was never going to be set on that world.