That's true, not everyone uses thermostats though, but I was thinking in regards to the engine being at operating temp driving down the road with the thermostat being open. All pressure will be the same throughout the system at this point.
You still want restriction to the intake or you're robbing flow though the block if you route it like that. My way doesn't rob flow from the block.
Heat transfer is about moving enough fluid through the hot stuff to take that heat away.
By the way: I'm also a Mechanical Engineer. Not just a pump salesman.
