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and what does racial skirmishing have to do with it? Let Leo explain the main idea, and this rule is clearly debatable, and no one can really explain it. If the idea is to fight with full armies after the 4th week, then LET'S play Bandit. We'll save a lot of time there. If the idea is to correct the mistakes of newbies who will put themselves in a vulnerable position with part of their army, then that's beyond reasonable. IMO, one of the main advantages of Heroes is the ability to "outsmart" the enemy, to outplay him. And you are trying to put everyone in the same pot to the maximum, and even if someone somewhere knows something - "no-no, stop using that."
P.S. If a "good" player makes a mistake and gets hit hard, that's his mistake, why invent anything else?