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Actually it is. Game companies have been doing it for awhile. Hell Fortnite lets you cross save between PS4 and PC. I can play Fortnite on my PS4 and close it down and launch it on PC and have the same account. I mean crap I purchased Fortnite on PC and my PSN account was linked to my Epic account and it made it so I had Fortenite on PS4. All Bungie would need is a way for us to put all the accounts on the same Bungie.net account. Oh wait we can do that! Then put in the code for it to read the accolades (the books/grimoire/ect.) from our profile to give us the pointless in-game stickers on a different platform. Oh wait that requires Bungie being able to code its way out of a paper bag. You're right impossible.
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The pc version is functionally different, which is why it's coming out a months later