Right now the only way to have a list of all contacts for a list is to setup an automation every time you add a new list to automatically add that person to the main list as well. This unnecessary step to add an automation every time we make a list is not simple. Why not have a "default" list that literally just is "ALL contacts" that just happens automatically? Either that or create a send to all contacts options for the broadcast, emails etc to make this all list not needed, but bottom line could be a lot simpler.