Steve Squyres from Cornell answered something kinda related on the jpl channel today[0].
"If you had the opportunity to bring a hundred and eighty kilograms of stuff back from the surface of Mars, the last thing I wanna bring is something I know exactly what is made of."
Opportunity did her mission amazingly and is resting in peace in the place where she was designed to be.
We learned a lot from her and her sister mission, now, the effort is better spent building over their shoulders.