So basically 2 wizard / 10 sorc and you can also have all the flexibility, evocation specialization, metamagics, and just give up your level 6 spell slot?
Lol, vastly superior to pure Wizard.
Yes Bg3 implements Sculpt spell in a way that it applies to any spell you cast whether it be from a scroll, wand, item or other class.
It's not a bad trade, but you then miss out on Empowered Evocation at level 10 - which is insane especially when it comes to Magic Missile (an evocation spell) as EVERY single missile then gets your +6 damage modifier (I have 22 Int on Gale) which averages to 8-10 damage per missile. A level 5 Magic Missile with Psychic Spark necklace shoots 7 missiles for 56-70 damage. Level 1 throws out 4 missiles 32-40 damage.