This is another version of the "balanced army" mission you were on in STW. However, the real problem is that units need to be balanced. . . which did finally happen in STW (at least to most people's agreement).

Just my opinion, of course, but I would rather allow people to choose whatever armies they like (although the addtional cost after four of one type of unit is good - and I wouldn't even mind if the limit was 3) while making sure that no units are so out of line that bulking up your army with them will guarantee wins in most situations. Otherwise, you are just substituting one type of cookie cutter army for another. Okay you can't have all oof and maa but you must have 1 of each of these.

Summary - carry on with balancing all units so this isn't an issue anymore - rather than making wholesale retrictions.- (and of course, this is just my opinion.)

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DragonCat
. . . on the prowl!