re: LLDEF already there: Surveyor 3
I'm not saying we don't have data about the Moon's environment.
I'm saying we don't have data about new materials and engineering systems reflection that Moon environmental data.
I doubt a Mark III spacesuit could last 6 months on the Moon without a major overall every few days. The Apollo astronauts suggested in interviews any new spacesuit for work on the Moon be simple and field serviceable. The Mark III and I-Suit are not simple and are not field serviceable.
If we continue on the current spacesuit design path I doubt the whole mission profile is sustainable.