This will never happen due to licensing. It would be actually better if they made fire team sizes scalable with content. Meaning flexible strikes, and raids.
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its not a licensing problem its a platform problem, that and they already cited the differences between systems resulting in a slightly uneven playing field, which they wanted to avoid. I don't blame them.
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This was never possible. Sony and Microsoft are competitors. They would never share their network.
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Destiny talks to both networks, but internally they didn't want the two systems in the same matches
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Its like that on every cross platform game. Since the beginning of time.