What's more durable, Luffy in a t-shirt, or Luffy with a suit of armor made of Wapol Metal?
The point of my post was to point out the sheer difference in the level of durability between regular flesh and Wapol Metal.
Why would Vegapunk go for the weaker option (flesh) just because Lunarian DNA is >>> Wapol Metal?
Using both ramps up the durability significantly over the weaker option, which practically is zero durability.