The parent was about discoverability -- you've argued that discoverability isn't necessarily useful for tools where people need to have some idea of what the to

The parent was about discoverability -- you've argued that discoverability isn't necessarily useful for tools where people need to have some idea of what the tool is doing. There are many tasks where the user needs to have an accurate mental model and a grasp of the details. I completely agree with that. Still, GUI programs are very clearly more discoverable than cli ones. How far and where discoverability is the best approach to educating a user is a separate question.