Well to say that's not allowed, you know how ridiculous that's gonna sound? Like Sony or MS would have to go to developers and say "Okay we'll allow crossplay, but you can't do it on these specific screens/frames, everywhere else is fair game".. Like that in itself just sounds ridiculous. On a technical level all that's happening is PS and Xbox gamers are connected to each other, and that would happen regardless of in game friends list or not. Plus.. Do you really think MS or Sony is gonna tell developers how to make their games? Crossplay is one thing cause they're connecting to each others networks, but to dictate what features can go into their games? That's not gonna happen.
Well technically it wouldn't be from scratch as a lot of it is already there and used in other ways (such as team side in game chat). I responded to the SFV thing to the other guy, plus, is one bad implementation really a reason to shut the idea down completely? That's just silly.. I haven't played SFV so I don't really know much about how it works but yeah.
I was talking about specific in game FL, I know there's a few games on PC with that but not sure Xbox. Even if not, that's because it's already done on a system level and there's no reason to put the work in for something that's already done. Crossplay would open up new possibilities and give a reason to do it.