Because they don't want it(For Destiny 1 at least). It's easy to see. Have they ever once talked about even wanting or discussing it? No. They did state that patrol was supposed to be larger, but the last gen could not handle much more than 5-6 people at a time(not the size of the map). They have not [u]once[/u] stated anything about private matches. Bungie doesn't have an issue with saying the PS3 and 360 are limiting Destiny, but private matches have never come up when they're talking about it.