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I can see a wedge helping where you have the airflow motive force being dominated by constant "push" forces as would be present from a turbo or supercharger. The reason being that side to side pulses or draw into the engine from left to right, right to left plenums are fed positively from the turbo or super charge. The side to side pulse is not disrupted by the wedge.
When we consider NA there will pulses from plenum to plenum as the engine draws air in. This will be interrupted by the wedge. There is no positive charge to help feed this need.
Have a look at the IPD wedge. In many iterations you will see holes, relief features which I believe is a feature intended to mitigate this NA flow issue.
NA engines: wedge value is questionable
Boosted engines: wedge could help cylinder filling
> as always testing is needed to know
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