In addition to what's already been said, I'd like to add another point. The real world can only go so far to explain why the game designers created the world in the manner that they did, then we have to move on to consider how much of their decision was based on making the game world an interesting and challenging world to game in.
I think in terms of the 'spirit of the game' you can have almost anything within reason simply because you're trying to make an interesting, challenging and fun place for your players to game in.
There's probably too much reliance on what would happen in the real world in some cases.
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