Levistus's_Leviathan
5e Freelancer
(emphasis mine)Somehow you can't move a comma of the other three classes without that infringing on the wizard. Also, it is a class that struggles to come with new subclasses. Outside of setting specific variants like defiler/preserver and High sorcery there is not much themes left to explore for the wizard. And if you give sage background to either of the other three, you kind of have the same basic character types covered. On the other hand, you can't really start with a wizard and end with an analogue to the other three.
Let me correct that for you. It is a class that Wizards of the Coast have struggled with coming up with new subclasses for. I personally don't have much of an issue with it. I take what WotC did for the War Wizard (combine two schools of magic) and did that for new homebrew subclasses.