i've read widely that cedar is less sensitive to moisture, and i believe the same may be true of koa as when i've played koa guitars in very humid stores, they seem less affected.
there's no reason to believe that a gloss finished guitar would be less affected by humidity than a satin finish, and since the inside of the wood of most guitars is unfinished, that side is wide open to the humidity in the place the guitar is stored/played.
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