As far as the fuel to the engine goes, its for driving at high speed with moderate load on the engine, if the engine doesn't need enrichment early. Maybe circle track, more like road racing, or high speed time-speed events like Silver State Classic. It also also means he use of smaller secondary jets for slightly better fuel control under hard deceleration.
Simplicity.
There's a truth! In fact, secondaries are rarely open to begin with. Passing on the interstate and drag strip is about it for most.
