Magic or Education?

Is it even necessary? The bonus to levels and characteristics only matters at the high level, where there is something to add. Knowledge of Necromancy is needed, yes, but with Sorcery and Artifacts, we have enough mana for spells. So, I think that Necromancer education is not necessary, only in the late game, and even Zoltán, who has it built-in and it has a direct impact on his ability.