I'm new to FFXIV long time MMO player, I have a question about the world exp bonus's. It would appear that all the exp bonus world in all the North American data centers are full, is this something SE is addressing to open up more capacity in these worlds or perhaps add exp bonus to new ones?
I am looking to play with my sister, when you select a world it provides careful instruction to ensure that you choose the same world as your friends but there is plenty of conflicting information on this. If for example I am in Hyperion and my sister ends up in a world that doesn't have the bonus, can I invite her to party and run around with her in game, does that transport her to Hyperion for the game and if so would she receive the same exp bonus? Or does it default to the least populated world?

TLDR: Want to play with my sister, she can't get into the same world I just started up, what option do we have other than both choosing a different world with no bonus in order to play together?