Race cars quite commonly run stall converters in the 5,000 – 6,500 RPM area and have low rear-end gears so they get TO their peak RPM very quickly.
Well, that kind of makes your car a turd below that RPM, plus with a street engine you are limited in the amout of static compression you can run because of the lower octane pump gas.
The last thing you want is detonation from running too high of a compression ratio.
Without enough static compression, a "good" cam can turn into a complete turd of a cam.
This is why radical cams “come alive” at RPMs usually around or above the 3,000 - 3,500 RPM area.
That’s the scavenging effect beginning to come into play.