[Red Badger]

... Dust on its solar panels caused the lander to lose power in December of that year

They couldn't design in a simple dust brush to clean them when needed?........

[Navy Patriot]

You have an excellent point.

NASA was aware that there was no maintenance available other than the robot itself.

The robot's ability to manipulate objects should have been able, by design, to manipulate tools for minor repair and maintenance of itself.