50% of mechanical work, 50% of racer work. It's not a secret that racers can drop for 7-10 kg per race. If we would talk about endurance championships, pilots there can drop even more kg. Their reaction and physical condition are the most important things. Especially, reaction, cuz you can easily be trained to control your car outside the race, but when you are in that racing situations, this is another thing. And ofc, you have to be ready to react for unpredictable situations, which are 90% of the race. Racing is much harder than e-sports anyway. There is no way to compare them. Chess and e-sports - yes, but not racing at all. For easy understanding: mechanics have to prepare car for at least 99% for the race, this is their work for 95% (5% is the work for pilot, cuz the racing car is made for them, they have to tell mechanics what settings to change). But when car is out of the box, it's 95% work for pilot.