Because I could do without CEA, Threemastered and 4 all in the same caboodle. I think 3 is fine just the way it is. Graphically. Well... you know what I mean.
4 is also fine just the way it is. Graphically and in other ways.
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I think I'll wait for the [i]Halo: Master Chief Legendary Collection [/i]that contains Halo:CE to 7 in one open world, for the [i]Xcloud Nimbus[/i].