Unless it's a physical limitation of the motor, "moves slowly" is still risky, because a programming error could cause the robot to move unexpectedly quickly in

Unless it's a physical limitation of the motor, "moves slowly" is still risky, because a programming error could cause the robot to move unexpectedly quickly in an unexpected direction! But "motor too weak to cause injury" is a good safety feature. The project looks really nice in the videos, by the way — it must have taken a great deal of effort to get it working so smoothly.