I think the higher pressure when heavily loaded or driving fast means its also an acceptable pressure at other times. If you are willing to compromise on ride etc.
Even if you sometimes exceed 160 kph, you will be slower most of the time. Also the loading is just an approximation. To use a Japanese analogy, 3 Sumo wrestlers probably weight more than 5 Geisha .
But it doesnt necessarily justify running pressure lower than 35/33 psi in the hope of an improved ride,etc , or just because it sounds too high compared to pressures recommended in the past.