It is only predictable if you follow the stress= MUST green move logic. Which is terrible.
Which is not any different from a normal dial.
The point is, a symmetrical dial can be unpredictable without having to sacrifice anything. Because every move is available in both opposite directions.
Whereas with an asymmetrical dial, in order to get the benefits of a certain move, you might have to limit yourself to one specific direction.
So I don't see any situation in which an asymmetrical dial is an advantage over a symmetrical one.
I was thinking about this a while back, I could envision Dengar running along the edge of the board with the good side turned in, so he can negate any flanking on the bad dial side. As long as you only present the strong side to the enemy it could be better than a symmetrical dial.

