Imagine if you had to drive your car to the store by giving it a full set of instructions (with as many contingencies as possible) - "turn the wheel 13 degrees, accelerator to 10% for 15 seconds, brake until 15mph...".
As a refresher of Control Theory 101, what you're describing is essentially the difference between open-loop vs closed-loop control.
As a refresher of Control Theory 101, what you're describing is essentially the difference between open-loop vs closed-loop control.