That's nice and all but look at when bungie release halo. Halo reach launched with 20+ maps, 15+ game modes, and an entire Forge World.
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It's because they want feedback on their own modes before they add more classics some modes like btb warzone and breakout (the elimination mode) have/will have their own special maps that aren't used in any other modes while other halos reused the maps so it feels like a more talored experience.