At least on a metal GM-6900 quick release bars aren’t protruding enough to touch the skin.Very interesting, I've wondered about that myself. Is there anything stopping us from swapping them with regular springbars on this square though, or any watch that uses them for that matter?
My only experience with quick release springbars is with steel [that which we don't name] bezel & band sets. The experience wasn't pleasant. When fitting them to screwback cases, upon removal I found that the pin on the opposite side of the quick release 'handle' would always bend because there was no leeway allowing the pin to move freely enough in the lug hole. I've seen quick release springbars with handle mechanisms on both sides, which would alleviate this problem, but casio's only have the one handle -- I'm skeptical if they'll ever work without issue.
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