Apples to oranges.
Microsoft funded Insomniac's game from the start. They promised them they could keep their own IP, something Sony didn't, and in return published the game as an exclusive from the start.
Without MS, the game wouldn't be made. Whereas, within a period of a year or two, Destiny has gone from Xbox lead platform, to almost year long timed exclusives for Sony. They get the alpha, early beta, exclusive year long content, and even exclusive content WITHIN an expansion pack. WTF?
A better example would be, imagine Naughty Dog buys themselves back from Sony, makes a new IP which is multiplatform and then, decides that Xbox gets exclusive alpha, beta, content, etc. How would the Playstation fans feel then? They would feel betrayed.
Sony has already announced that they have secured a long term exclusivity deal with Bungie. This means you can expect every bit of new content to be like it has been so far. Have fun not feeling betrayed when The Comets come in and we have to wait a year for those.
But don't let logic get in your way.
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I'm just saying the game isn't exclusive be glad your playing, I have every system so I don't care though