Maybe I'm delusional but the one moon mission I could get behind would be placing a telescope on the surface. I don't think there's much by way of wind to deposit moon dust on the lenses, could have some sort of air blast cleaner for that one would think. If it could be made so that servicing could be done by robot missions, maybe replacement of modular bits, seems like it might be trick, dunno.

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1986 300SDL, 362K
1984 300D, 138K