Henry Evans argues wheeled robots like Stretch beat bipedal humanoids for people who can't walk, saying "wheels are cheap, stable, precise, require very few controls" and noting that when a wheeled robot is emergency-stopped it "freezes in place," whereas "a bipedal robot gets run-stopped, it collapses on anything under it, including the patient."
- wheeled base is cheap, stable and precise compared to bipedal alternatives
- freezes safely in place on emergency stop instead of collapsing
- usable with very few controls, important for users who can only operate one or two joints at a time