agree very much.
"spell management" - i suppose you mean mana/spell point management?
anyway, manage to choose the most effective and efficient spell is critical to wiz who got less mana. and Wiz is less likely to nuke or instant kill every mob for the same reason. It helps you learn how to play as a team.
when you are familiar with the spells, mobs, and know when you should or should not cast spell, when to use what spell against which type mob, know how many and where are the rest shrines in diff quests etc. the mana pool will not be so critical.