Tyre pressure recommendations are always for cold pressures - that itself allows for the inevitable rise in temperature - so I wonder if you've read HJ correctly, not thast I've seen it.

Some brands/models do quote two pressures for comfort/normal with an increase for sporty driving and full load pressures are usually given as well - some but not all models have separate figures for towing duty.

The only time I can think of legitimately reducing pressures below normal is for off-road use.

I set the pressures so that the tyre wears evenly across the tread.

On my landcruiser, the recommended pressure was too low, and the centre wore more slowly than the edges. Raising it a little gave me even wear.

On my MX-5, the recommended pressures seem spot on.