At level 16/22/26, ,,, (?) wizards get an all enemy attack, why not ? If there is an all enemy attack for wizards at levels 16/22/26, then I'm sorry, I didn't know.
Death's advantage is being able to use absorb attacks that heal the caster while hurting the enemy. Death and Life both don't get AOE until higher levels than other schools because of the nature of the schools. Death gets both trap and blade at a lower level and higher power than other schools. Every school is different in how and when and that type of spells they get. That makes the schools have different play styles and balances game play.