Hard disagree. The evocation passives are plain busted. Removing friendly fire from your aoe spells and adding spell casting modifier make for extremely potent and efficient aoe damage, whereas sorcs and warlocks have to select less targets to affect with an aoe spell so as not to splash their martials, summons, and ally npcs.

Moreover, the sheer flexibility of Wizard courtesy of scrolls is crazy. The problem is that just like rogue, powerful passives like learning spells via scrolls or extra attacks from rogue or action surge from fighter should not be made available via multiclass. Multiclass really ruins the viability of pure builds because for many classes, the later level passives don't overcome the sheer OP nature of extra actions or scroll learning. Gear like the 17 int circlet also guarantees that you can use wizard spell without much of an issue as an off-class.

But this is not wizards being weak, this is itemization and consumables and multiclass passive availability breaking the balance. Same goes for abusing surprise and sneak attacks or throwing potions for an aoe heal where consuming the potion only heals one person. Stupid design.