Making the traffic controller load a flight plan into the plane’s computer merely changes who will make the mistake. If you want to suggest changes, suggest something that actually has a chance of reducing the rate of errors.

Besides, pilots don’t just blindly follow the waypoints on their computer. The pilots would have spent half an hour before they even got in the airplane reviewing the plan for the flight. This includes reviewing the published departure information for the airport. In that briefing they would have specifically noted that the direction they will turn after takeoff depends on which runway the tower tells them to take off from. They cannot necessarily guess which runway that’ll be in advance.