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Okay, but what if the enemy has Chaos and keeps adding it? Or if the enemy is a Dhalebb.
Then, if you defend the formation with a Spearman, you could lose up to half of your stack.
1) If a demon has magic, this ordinary mana might not be enough. Besides, the ability itself is then used incompletely; you need to try to use all its aspects (but not at your own expense, of course).
2) And if you choose maps where each player has only one city, and there are few players (or only 2), there's a chance that a hero will learn a spell in the city. But what if no spell drops in the city? Relying on altars is foolish; the drop rate is quite low, and there's nowhere else to learn spells (unless the enemy uses it, and you have the "Uncover Secret" perk, but even then, the probability isn't that high). + If you make a move with cavalry attacking another stack (or they manage to move after the cavalry but before the demon), and the Imps (or their upgraded versions) don't reach, what then?
What if the enemy is a Dwarf? (We're talking about the "Armor" skill).
Or what if the enemies have less than 12 initiative, but more than 11? (Swift Riders have 12, just 1 more than that...)