Hey Niall,
If thats 2 bobs worth, sure glad you didn't offer 2 dollars worth

I agree with what you say but IMHO that only applies to people who are riding on "C" kites where you are at the mercy of the kites speed.
The Converse (traditional surfboard shape) I ride is very good for me because I ride a Halo (bow) and can adjust my board speed accordingly to suit the wave by just dumping power with the bar. This allows me tighter turns, slower speeds and access to upwind right handers

all with more control.
I do think you are right though, there is more evolution to come yet. Alex Gillan was "onto it" back in 1999 with the 5 fin directional poly boards. The first Australian Kiteboard shaper had vision enough to design tomorrows boards 7 years ago.

It's all swings and roundabout really, if it works for you, ride it and ride it hard, and make sure you smile when you are on the water, it's more fun that way!
Good winds, (a nickels worth)