I believe the biggest issue is the way certain code structures work with the architecture of the PS 4/XB1. And that will not make them compatable at the server end. Kind like trying to stick a porsche gear box into a ferrari.
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The xbox one and ps4 has the same arcitecture. And if bunge runs the servers it ain't that big of a hassle! As a game developer i can't really see the problem. The community is ready for cross platform games! Please make this possible !