cmdrdredd
Lifer
i'm almost positive if this was the case, microsoft would do it automatically for you and it would be very streamlined. sony on the other hand doesn't care about that which is why you see so many games integrating online components so differently. ms requires things to be somewhat standard if you want to integrate with xbl.
Well, I'm not sure it's sony so much as the developer themselves. Diablo 3 on PS4 links your PSN ID to your battle.net account so you can easily connect with people.
It's not that hard to figure out ways for it to work well, they just have to care about doing it in a way that makes it easy on us.