A horse is a brain on four legs. A horse is not a body with four legs. If you want a horse to do anything you should have a conversation with the brain.
My take on this concept is that when a horse is first started, having a job to do can assist a horse to get comfortable with just carrying a rider and following some direction.
I believe that training should involve working through as many challenges as practical to help a horse cope with life as a horse. For this reason, I will even invent challenges that have no practical purpose just as an excuse to grow my friendship with a horse.
I want my beginner horse to learn to have confidence and feel untroubled by following the pressure in contrast to going away from pressure or being sent somewhere in response to pressure.