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As Ben explained:
Hard Deck was used initially for bridges where you want the bridge deck to be hard, but still have the ability to fly underneath the bridge. It also is useful for being able to land on hanger roofs but still be able to go inside.
"Deck" is a very confusing name for this in the UI: Unless you know the specific bridge case, that the top of a bridge is called its deck, then extrapolate that case to your case it makes no sense.
I instead propose "Only Slightly Thick" which is short, describes what happens to this surface behavior, and answer the next question "As opposed to..." better than "slightly thick" does.