Can you compile a list of games that have compatible cross-play between XBox(360|One), PS(3|4), PC, iOS, and Android? Will that list be long enough to count on two hands?
It is a conspiracy. Microsoft does NOT want you to be able to play games with your PS4 friends. Microsoft wants your friends to buy an XBox One so they can play with you because you’re so popular. But Sony has the same dastardly plan: they know XBO owners wish they had a PS4 and don’t want to offer any comfort. MEANWHILE, Microsoft also doesn’t want XBO /PC crossplay to be widespread because then they compete with themselves: most of the time it is more convenient to play a game on PC as opposed to a console, which is especially true now that there are Windows tablets. MEANWHILE, neither Sony nor MS wants you to be happy you can use your iOS/Android tablet to play with your XBO/PS4 friends: that might encourage you to NOT buy a PS4/XBO. MEANWHILE… get the picture?
Cross-play is a feature that video game companies have violently argued we don’t want since the Dreamcast made it a question. Valve has even performed studies to show that, in their opinion, console gamers look like total n00bs compared to PC gamers therefore please stop making Half-Life 3 jokes and get on with buying $600 worth of games in the Steam Summer Sale.
The tech is there and easy. No platform wants to allow its developers to do it across the board. Believe me, for the companies who DON’T make the console the benefits would be great, but they’re beholden by the console/mobile licensing that won’t allow it.