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Let's try...
1. There are no spells that can increase a hero's survivability (like Heavenly Shield or Magic Life), not counting Dragon Strength, but casting it on a Druid is pointless, and it will only give him a small boost.
2. There are no spells capable of removing negative debuffs (like plague).
3. There are no tank units capable of protecting a hero from enemy arrows or attacks (like a Bone Dragon).
4. All effective combos require a lot of time (Phoenix + Strength + constant replenishment, plus you also need to cast Swarm and Anti-Magic).
That's about all the drawbacks... add to it if I missed something.
By the way, I try to get Necromancy for my fighter at the altars, and there's a good chance of stealing something useful, up to and including the Zombie Horde spell, and then the Phoenixes won't let me down, and Haven has better spells.
P.S. If I didn't understand something, excuse me.
С самого начала позаботься о своем месте в жизни, чтобы не уподобиться маятнику. /Херберт. Ф./
Клан: "Смертельный Альянс" - "Mortal Alliance"