You can twist virtually with good precision. But, what is much harder is the feel, state of the knob, particularly when it is released and then gripped again.
Mechanically, the structure of the knob can take some energy input, and it serves as a mechanical pivot, or fulcrum, depending on how people use a knob.
Without all those physical things, people lack the complex frames of reference needed for fine, "thought is action" type control.
This is especially true in environments where gloves are worn.