Regarding your 2nd point (which I assume was meant as a joke) - as a fellow unicycle rider and teacher for over 25 years, the first thing one learns is how to d

Regarding your 2nd point (which I assume was meant as a joke) - as a fellow unicycle rider and teacher for over 25 years, the first thing one learns is how to dismount safely, feet first and hands outwards in preparation to hit the ground for those extreme cases. My worst crashes were when my shoelaces got caught in the pedals (only once many years ago but since then I always check that my shoelaces are stowed), hopping/tricking, or off-roading. A warehouse environment in comparison is rather sterile and the robot probably won't be performing any tricks so I think the designers can safely forego a helmet.