Ok, but you didn’t define what “proper” use of a computer means to you, which leaves the entire thing open to interpretation. I would say practically everyone is capable of using a computer to complete an enormous range of tasks. Is this not “proper” usage in your opinion?

You are conflating "use" and "control". I mean literal proper control of a computer, meaning the human controls (also programs), and especially understands, every aspect of what the computer is doing and can do. This is what a real AGI would be capable of, presumably. This includes knowledge of how programs are executed or how networks and protocols work, among a lot of other low-level things.