Even if battles are auto-resolved, which they should be to keep a reasonable time frame, it would be a lot, lot more fun and a lot, lot more challenging. Practically the easiest way to "make" a good AI is to give the faction to human player.
Those who whish to fight tactical battles can do it in the current MP system. Of course, this would be completely independent from the MP campaign system (so basically there would be two MP foyers, one for campaign, one for tactical battles) but IMO most of the campaign battles are not fun to play out anyway, given the disparity in numbers.
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