A more generous reading of that comment would be that it’s other things not the camera’s that are causing the problem. A CCD image sensor that’s lost 20% of it

A more generous reading of that comment would be that it’s other things not the camera’s that are causing the problem. A CCD image sensor that’s lost 20% of its pixels could still be providing useful information, especially if you’re just trying to get the robot out. Other systems may inherently have issues long before that point.