Is More Flow Better, Is The Smallest Intake Port That Flows The Most The Best

@273 the more efficient(better designed) a port is, the higher a velocity it can operate at. High velocity is "free" supercharging, augmented by complimentery runners. They actually work better with smaller valves because more curtain area is used, which allows for less shrouding as well. Poorer ports tend to work better with larger valves deshrouded because they need as much low-mid lift flow as possible to crutch poorer high velocity flows, most OE ports are poor to decent. Very few are great, but some can be modded to be very good/great, so that's where it stands.
I agree velocity is important but I think over worrying about leads to strangling your engine, say you have a zero decked 367 with a xe285hl cam, for most their choices for heads is what is available, at the very least stock 1.88 heads and max for most trick flow. It comes down to $$$ and how much power for most they have little control over it.

Velocity like everything else about balance and compromises, too much of anything can be bad.