What Should Single Camera Robots Do When The Lens Is Blocked

Mistral’s Robostral Navigate is genuinely exciting: an 8B model steering wheeled, legged, or flying robots with one ordinary RGB camera, no lidar or depth sensor. Mistral reports 76.6% success on unseen R2R-CE scenes, with training done entirely in simulation. The cheap-hardware argument is strong. It also leaves one eye as a very obvious failure point. Homes and workplaces have fingerprints, glare, dark corridors, mirrors, swinging doors, people carrying boxes, and cameras that get bumped. Before a one-camera robot moves, I’d want one boring confidence check: lens clear, view fresh, route visible. If any of those fail, stop and ask instead of filling in the room from memory. What would you trust as a fallback: slower motion, a second cheap sensor, or a hard stop until someone clears the view?