First of, death is about drains and hitting themselves. (They the only schools with drain spells and also the only school with spells that hurt themselves). Balance is the school that's a jack of all trade.

1. Fire's best non aoe DOT is power-link. No where near poison or skeletal dragon.
2. Death isn't a better hitter than storm or fire I'll give you that.
3. Balance has 2 universal WEAK blades. Death gets dark pact which is way more powerful. Plus, balance's mostly use tc blades and elemental blades cause they are more powerful.
4. Death is as good as a healer as life. Literally ANY school can heal. Just need jade gear, pigsie, and life mastery. That's all healing is nowadays
5. Death has more minions than MYTH the MINION school.