> The Lustron, for all its failings, certainly proved its durability. Of the ~2.5k built, ~1.8k are still standing,

Doesn't sound like much of an achievement.

The town I live in (in Norway) is full of wooden housing built in the same period or earlier. I'm pretty confident that far more than 75% of them are still standing.

The brick built house I owned in the early 80s in Southampton, England, was one of a street of hundreds of houses built in 1890. The whole street is still there together with dozens of others of similar or greater age.