Succinctly, I would say any GM who says 'I don't want to spend my time thinking about the in-game world' is just someone who would be happier as a player but is taking one for the team. In the metaphor, he's the guy at the orgy squeezing a fleshlight between his thighs and wearing a wig so his buddies can pretend. He's trying to be creative with what's lying around. However, everyone would be happier if he wasn't in that position. They're all just too desperate to go elsewhere. I mean, it's really nice of the guy to do that for his friends, but it's not really what they showed up for.