I guess I'm just ignorant: what's so special about upside-down stairs that has everyone in such a tizzy?
Less blocky-looking structures. Yes, I'm aware that this is an odd thing to say about a block-based game, but it's the truth. As example, imagine a large, elaborate staircase you can walk below because it's so large, and you want it to look less large-blocky on the underside and more like the actual stairs themselves. I'm sure there are far better examples, but that's the only one I can think of right now.
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Is it a chicken or is it a duck? - It's a chuck, because dicken sounds stupid.