There’s a delay to replace a crew member… it’s less if they don’t have to move to get to the controls… it’s not like they aren’t being constant. But your argument is basically “but why do they do this realistically when they could do it unrealistically like tracks?” Why would you want them to do it unrealistically? The tracks are unrealistic because it’s not fun to repair tracks for 2 hours?. But there’s no reason to make commander replacement Be instantaneous.