Different gens typically have some differences in how coding is processed, so that's where the issue comes up. I mean really, if you look back, how many really good games are there out there that were made for two different gens and done well.
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Only ones I can think of are minecraft and dragon age inquisition and diablo 3, which all did very well. Wasn't destiny designed for xbox 360 and ps3 first, then ported to the others or was it the othet way?
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Minecraft and Diablo 3 were originally last gen, then later ported to next gen. I have no idea what there original ideas for which gen Destiny would be made for, but it ended up being for both.