I must say if you look at the latest motorbike
carb and efi setups there is some emphasis on the
area that this old bloke focuses on. The base of
the throttle or slide are biased in a way to increase
the flow of air at a point on the base.

Like all things we wont know till someone or
others have tried it with conclusive evidence.
Mercedes have their own vortex generator manifold
device patented but never looked at it myself.

The Iris throttle body is interesting if used for
Formula 1 but would it suit lower road engine speeds
is the real issue.