Lol wizards are amazing in this game and in general far better in 5e than 3.5 especially when it comes to early game.

More spell slots are needed sure, and scroll casting should go for classes that aren't supposed to (or intelligence scores below 8) but that's it.

More spell slots would be welcome, or (if I may) downcasting. The homebrewed larian potions are amazing and well flavoured so leave them.