Hum, but simpler also means cheaper...
I think that NASAs agenda was towards having many low-cost missions, rather than a few high budget ones.
The use of `off the peg` and recycled parts must be a better solution to a cash strapped nasa.
But i suppose that this particular mission is very public and news worthy so i imaging that they did provide a lot of `redundant` features to the design...
Either way they have brought us marvellous discoveries...