One of the real issues as proved by the 2024 playtest, is that wizard players want everything.
The Sorcerer, Warlock, Psion, Elementantist, Witch, etc classes suggest soloing off a chunk of spells to being class exclusive and determination of power based on exclusive spells.
It's a real fight in the community to say "Here is a spell with a powerful magic effect for its slot. It's balanced because we designed it for only this class to get it" and stick to not handing it out.
For example to me, the Psion is defined by it getting Telekinetic and Telepathic features early than most casters do. Adding those types of spells to the wizard spell list would break them.
You'd need to break up magic further into more parts.