When considering mass airflow then the burr finish or whatever method is used to rough up a surface you can mostly see that on a flow bench.
After spending a stupid amount of time on the dyno watching the numbers and such that it isn’t really about mass airflow but it’s about eliminating or more accurately reducing wall flow that’s always present when and where fuel is added to the intake.
Getting that wet fuel off the surfaces and back into the airstream can pay big dividends.
You just have to overcome the way some people think in that if the jet size gets smaller than orthodox they panic and rather than learn they want to stop because they are sure it’s going to eat itself when the fact is it’s getting hurt with all that unneeded fuel running through the engine.