List of fallacious argument techniques
(picks up a stick and sets about belaboring the cadaverous equine)
Again, please read the discussions on this topic. As with most dynamic systems, there is probably not going to be a simple blanket answer that applies in all situations, regardless whether it's issued by the manufacturer or anyone else.
As the Ford Explorer/Firestone debacle indicated, low pressures are probably more likely to lead to tire failure, crash, death & dismemberment, than are high pressures.
Running the manufacturer's recommended pressure will only optimize one thing: your ability to blame the manufacturer if something goes wrong.
For best economy or smoothest ride or longest tire wear or "safety" (best handling on snow? Best handling (turning or braking?) on dry pavement? Best wet traction? Best impact resistance? Best heat resistance?) it's very unlikely that any single pressure will be optimal.