It's hugely ironic that a company that built it's empire on an almost literal mountain of FUD** is actually afraid to let their customers coexist with customers on alternate platforms. I mean, think about it, how confident about your platform/product are you if you intentionally prevent users of your platform/product from interacting with those on other platforms? Seems like Sony is pretty confident, and Microsoft is too scared to share.
** FUD - Fear Uncertainty and Doubt - M$ spent decades actively trying to scare people away from the competition, and towards their own products.
