Are you thinking ergo as in bent like a mountain bike bar?
Or as in a asymmetrical cross section for the grip like some bike grips?
If you look closely at the 2014 (and 2013 I think) North Trust bar the cross section is actaully slightly asymmetric. The cross section gets more rectangular right where your 2nd knuckle forms a 90 degree bend when gripping the bar.
I definitely have thought about what could be gained from more than just a simple straight bar and round profile in a kitebar. One of the tricky things about comparing it to say a bike handlebar is that the function of the bars is a bit different. Not to say there aren't gains to be had but it's not an apples to apples comparison.