It could be useful when discussing lightcones of others. If we have two alien neighbour planets aranged so, that we are in the middle between them. Then we co

It could be useful when discussing lightcones of others. If we have two alien neighbour planets aranged so, that we are in the middle between them. Then we could see both aliens' election results at the same time, knowing that aliens still have to wait a bit before they know each other's results.