Sure, but there aren't that many useful spells in BG 3. A level 12 Sorcerer could just get it from the Sorcerer spell list and have more metamagic points. Not saying the flexibility isn't useful - it is for sure, but the overlap between Wizard and Sorcerers spell is so huge. You probably want to also get something like Sculpt Spells out of it, for it to be really useful.
Wizard 1/Cleric 11 is more of an issue.
Thats my original point - in this game at least a 12 level sorc is still far better than a 12 level Wizard.
And if you do want to play a wizard, a 1-2 wiz / 10-11 sorc is superior in all regards.
So this crazy build I just found and tried on the Wizard hireling, you stay INT based but only take 2 levels Wizard for sculpt spells, then either 8-10 level sorc with storm sorcery and optionally 2 levels cleric tempest domain for max damage to a lightning spell.
You use your offensive spells from memorized scrolls to use the INT stat, and fill the sorcerer slots with buffs.
But the flaw I found is you have 2-4 less sorcery points, you are giving up an extra quicken or twinned chain lightning for 1-2 max damage rolls with some amulet that adds a divinity charge, but that amulet is very close to the end of the game so meh.
In earlier DnD games there were usually features where your total caster level is based on levels in that class, so if you tried such multiclasses your spells would be a lot weaker. In BG3 doesnt matter what combination of caster classes you take, you get the same number of spell slots and only need 1-2 wizard level to memorize all the spells.
But even if you nerf the multiclass options, still doesnt change the fact that 12 sorc >>>> 12 wizard.
