Every functionality requires control

The more complex something is, the more controls it needs, whether visible or invisible to the user.

• From the user's view, products and services are automated. If you stay at an expensive hotel, your room is always as you want it. The staff handles the complexity behind the scenes to make it happen.
• On the other end, we have products and services that require users to control every step. A professional photographer is likely to use a camera where they manually set every setting. The amateur photographer might use a camera that chooses the settings, transferring the complexity to the inner working.