I actually don't own an xbox, but I did follow the news on some of the franchises that ported over there. I was unaware of a 4 player maximum in them.
As far as command points go, it's all a matter of game mechanics at what works best. In most instances, the best solution is just to allow them to be variable. The big upside to this setup is that as the game ages, the machines get better and can effectively run command point levels that were formerly impractical.
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