> a CLI app does exactly what you ask for, and has a manual documenting exactly what command do what, and the output is consistent, the same command does the same thing period

This is a very software-engineery point of view and totally false for the ordinary user. Heck, it is even false for me as a software engineer.

> since you know people like moving a mouse and clicking on buttons

No, they like well-designed user interfaces, and the UI design of a typical CLI is abysmal.