Oil pressure is actually a measure of oil resistance. It is largely determined by clearances not flow. You have proved that point again.
Engine builders that know what they are doing make clearances a major priority. They plastigage every bearing journal twice. Once and then once more after spinning the crank a quarter turn.
Theoretically if you could close the oil system at say 40PSI, and keep the oil cool you would not need the oil pump. It is used to move the oil to the rad to be cooled only.
Do you know what was good about the good old days? I wasn't good, And I wasn't old!
Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....