What's the point of having separate data centers within regions? It just means I have to move servers to play with my friend on Siren but that means I could no longer play with my friend on Coeurl.

Seems like a needless decision to me. Considering that this game still charges a monthly fee and collects microtransactions on top of that......that they could swing a way for people on every data center in a region to play with each other.