When you get the port too big, lower RPM torque suffers. Look at the Ford Boss 302 and Clevelland 4V heads. Huge ports and low RPMtorque suffered. They came alive at 4000RPM. CHI developed Clevelland/Boss heads they call 3V that are 4 barrel quench combustion chambers and 2 barrel ports. Realise Ford Australia used the Clevelland engine for a while after Ford North America dropped it. They also built piles of 302 Cleveland engines.
Airflow in a port stalls at some point, limiting velocity and flow. Working to get high flow velocity builds pressure in the bowl and aids cylinder filling as the piston rises before the intake closes on the "compression" stroke. This greatly aids cylinder filling and density.