Here's some pictures you might find thought provoking. These are side by side intake port molds of an OOTB SBM Edelbrock RPM head and a Trick Flow 190. Also a pic of the TF intake bowl. I was a little blown away by the bowl design downstream of the guide on the TF. Looks like this design is one of 3 things, or maybe a combination.
-Fuel shear ridge
-Swirl inducing (or swirl canceling because of the direction)
-A fix (or band aid) for the flow stall that happens after the venturi convergence point of 0.500 lift
I really don't know the answer, but I hope to find out. I'd love to get the facts, but opinions would be interesting as well.
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