Why care about CLI applications?
Because they improve our productivity by keeping us focused on the task at hand.
You see, when we switch contexts between different applications, the chances are that we lose sight of what we were doing and get derailed from our task by some other unrelated activity.
By relying on CLI applications, all the commands that we type and execute happen to be within the same terminal, so we have a better chance of staying focused on what we are doing, thus achieving more.
