No general goes into battle, without a reserve that he can throw into the battle to cope with unexpected moments. That sort of gameplay is fun! incidentally, when you play against real people, that's exactly what you have to do. You can't throw your entire army into one huge attack and leave the flanks unprotected. ("Why garrison the beaches, he'll never go that way") You can't gamble on exactly one outcome of an event chain, or of the exploration game. You can't rage-quit just because the opponent spoiled your "perfect" borders in north america. You must cope. That almost never happens in EU3 SP, because there's so little randomness, and you can min-max-optimize everything.