Agreed. I don’t have experience with turbo cars but with old school stuff if you simply hog out the intake and exhaust ports on the head you can achieve really good flow rates but you loose the velocity and the fuel falls out of suspension. The end result is a motor than has a slow flame speed and lower combustion pressure and power. A well flowed head increases the flow rate but maintains or increases velocity. How that translates to a fuel injected turbo vehicle is a little beyond my experience but the throttle body ultimately is the restricting part.piping.
I think tuning can play a large part in reducing lag and increasing throttle response