From university, I vaguely recall that, I had to implement a lot of feedback and correction calculations when working on industrial robotic arms. Usually too much speed causes overshooting(going the wrong trajectory or away from target). The feedback is constantly adjusted until the target is reached, hence a lot of expensive computation and readjustment from all the sensor feeds. Additionally, faster movement also has risk of damaging nearby objects when overshoot happens and also harms/degrades the joints faster. For a simpler example, think about the elevator, what would happen if it were to go up/down very fast, how would you tweak your PID controller to handle super fast movement to not throw your passengers when you need to correctly align and halt at the target floor….