Physics don't change with time & I DID mention some n/a types of racing. I've run wedges & hemis too & while I agree,to a point, 21st century technology is different, given the parameters I mentioned, there's no easy way to beat a hemi.
It's not just me talking --- engine builders like Sonny Leonard, John Kaase, Arias Pistons & a few others, all (& in some cases still) use & develop hemi heads where rules allow. The BEST example is IHRA P/S --- no matter what the brand, some derivitative of a hemi head is used