Originally Posted by R-A-B
Problem is that you could get into a distinct paper-rock-scissors form of army set ups making more people bail out of fights upon seeing the enemy and realising there set up has no chance rather than, well, fighting.
If someone is bad at creating a properly balanced army then that's the player's problem, not an issue with game mechanics. If you spam all archers why wouldn't you expect an army of all cavalry to bash your face in? It's why in Total War games having a balanced army is so important and much of the game revolves around proper army composition. That's sort of one of the best features of RTS games and Dawn of Fantasy throws all of that to the wind and lets your units be jack of all trades.