Effects of valve lift - worth it going higher?

[totta Crolla]

"The effect of this constriction shows up as a pressure drop through the intake valve. So why don't we just open the intake valve further? Because when the valve is lifted a distance equal to 1/4 its diameter, the area of a cylinder around the valve (that the fuel/air charge passes through, not the engine cylinder) is equal to the area of the valve face and intake port (ignoring the valve stem). See Figure 1. Mathematically, the area of the cylinder is (2 (PI) r)(d/4). Since d = 2r, this evaluates to (PI)r2, which is the area of the intake port. Experimentally, the amount of additional flow through the intake port increases very slowly as the lift of the valve increases beyond 1/4 of the valve diameter"

Stolen from here:

http://www.eaa1000.av.org/technicl/engemp/engemp2.htm

I'm guessing that the Cat cams man is assuming you will fit larger valves to suit the higher lift.