Can we build the math from the ground up? (And does Vancian help or hurt that?)

[Cluedrew]

Healing magic (at least without major 3X shenanigans).

Right of course, still usually a spell thing in D&D but not a wizard thing. I non-spell casting thing would be even better but at the same time I know what system we are talking about.

It seems to me that the onus should be on you to prove that Wizards can do everything that can be done.

Actually I was curious how easily someone else could disprove the statement more than disproving anything. That is why it was phrased as a question and as a statement.