Let's see if I got this right:
A straight shackle aligns the two eyes parallel to each other. That is if you are looking at the shackle's open side you would not be able to see through either eye.
A twisted shackle aligns the two eyes at 90 degrees to each other.That is if you are looking at the shackle's open side you would not be able to see through on of the eye, but you would be able to see the other.
So the point of the twist is for proper alignment I'm guessing especially if you're using it to attach a line to a piece of hardware like a block that you want aligned with the next line.
Any other purpose?
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