I need to write my "Wizards are a problem" rant...
They're an absolutely huge problem, because of the tradition that they:
A) Basically don't have any class features at all, so have near-zero design space.
and
B) Can know ALL of the Arcane spells and cast them at ton, so are kind of overpowered out of combat because access that broad is overpowered (Sorcerers aren't because they have far less access).
So they delimit what you can do with a caster, and also demand a design that's both unengaging and powerful, and benefits heavily from system mastery. Previous editions were a problem too.
In 3E, even ignoring LFQW, they caused a massive problem for Prestige Classes, because basically any Prestige Class which allowed you to continue to advance as a full caster and had any features at all was Objectively Superior to being a single-class Wizard. And single-class Wizards were
already at the top of the power rankings.
In 4E, they actually had to conform to 4E's class design, so were a non-problem, but people who wanted the usual OP system-mastery Wizard were at the sort of levels of rage and grief only previously experienced by Achilles after Patroclus died.
They really need a rethink, and busting down to "just one of the boys", class-wise. They need actual class features, too. This is will absolutely definitely never happen in 5E or 1D&D though, zero chance.