I'm just elaborating in what grazr said, but this is what I think.
Spiral staircases are not good generally. For starters, players don't lie franticly whipping around the mouse in any occasion, and small, tall spiral staircases certainly involve a lot of wrist action to get up. This ultimately means they can interrupt the flow of the map and conflict and end up not being used much. Also, they can be a bitch to playerclip depending on their dimensions.
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