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Inconclusive.

What if they built right-handed defenders AND left-handed defenders towers?

Oh, but what if the attackers divided themselves in left-handed and right-handed attack groups, and chose the stairs to attack accordingly?

This is getting silly :P

I think these staircases evolved to make it impossible for rapey male ducks to impregnate the castles. Ancient sources agree with my theory, so it must be true.

In support of your theory: no medieval castle ever laid duck eggs that hatched.

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(An earlier version of my comment ended with "... ever laid duck eggs.", evidencing both my deep ignorance of medieval warfare and the biology of egg laying!)

You're right, but now I'm disappointed that this didn't make it into Monty Python and the Holy Grail!

The article states that they likely built neither because nobody wants to be fighting for their life 1:1 on a dank staircase with poor visibility. It's actually the much more logical option. Even if attackers are in the stairwell, why wouldn't you retreat to the top where you can accumulate real advantages?

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