You do if you are a University Air Squadron student being taught by the Royal Air Force. The training is intended to equip the student with the ingrained habits which will make him or her a fit and safe operator of a fully equipped, heavily armed, supersonic aircraft. The groundcrew / start up crew is a fully integrated part of the team which gets that aircraft away safe,( until it is required to be dangerous), and serviceable. Many of the effects of operating controls are not visible from inside the aircraft so the pilot relies on the groundcrew to check that such controls are functioning correctly.
Don't criticise it SS, it's you who are out of step.
Mike W