Think about the form of the statement you are making: "I don't know X, and it doesn't seem like I need X." Well, how do you know you don't? You have to compare current world to a counterfactual world where you did know X. How do you know you wouldn't be vastly better off?

That's not the statement I am making. I do know X; proofs were required coursework for every CS major at the educational facility I attended. I've never needed it.