lionkor parent
So three ones, two different models, one in a different location. These are like... basics, no?
If you multiply every critical component by 3x there will be no room left for anything else.
2n + 1 is a basic minimum amount of redundancy for anything critical in a high-value space mission.
This isn't a high-value space mission.
The price of a ride to the moon alone would make this "high-value." Cubesats are an example of when you can get away with no redundancy, but this is not a cubesat.
This is best compared to being a lunar landing cubesat. IM is an order of magnitude cheaper than a comparable NASA lander. Cheap is the point, and cheap carries with it some concessions to risk.
Well the way they did it (twice) means they had space for other stuff, and of course also failed because they didn't have enough redudancy