re: LLDEF
True but they have been there for 35 to 40 years.
Besides I would want to test new materials and better seals for bearings.
Aanyway, I suspect we would be depressed by how much damage there is to the Apollo sites. I bet foot prints are gone or at least almost gone and dust covers everything. For sure the flags are bleached white sheets of brittle nylon.
But we sure as heck better visit those sites after we return!