The Laws of Physics are foreign things to many...and is an ever evolving thing...like the new theories are proving Einstein's theories that nothing can travel faster than the speed of light
Back down here on earthen soil...tire inflation depends on many, many attributes and there is no one size fits all...
But, since many do not understand...and we are in a most sue happy society....the OEM's has to CYA with labels (molded in, stickers, etc) that in court provides a basis for defense...
Those labels typically reference maximums and if you go lower...YOU have to re-engineer