This is exactly my point. If a car has squooshy springs, shocks, swaybars and 65/70 series tires, you can max out the pressures and most of the time it will likely work better. A tire with a narrow contact patch will definitely work better at high pressures than a tire with wider contact patch. I put 55 psi in my Yukon XL 2500 and can I run over sports cars with bad drivers on freeway off ramps. On rough pavement things can get a little chattery, through in the YXL so I back off the pressure a little. You have to find that compromise between a smooth parking lot handling and the real world.
Tire pressure is a tuning tool in the toolbox. Going up is always better than going down, but going down may work better. I remember 20 ago a guy at the track with a GN was super proud of his 1.8 60 ft times with his new drag radials at 13 psi. He didn't like the scary handling on the "big end", but his new tires launched way better than the radial TA's he had on the car before. I showed him my 1.7 60ft time at 18 psi and that my trap speeds were nearly 10 mph faster with less mods and less boost...and I drove it over 100 miles one way to the track at those tire pressures. His launch traction was from the tires acting like a deflated basketball and that is not how drag radials are supposed to work.
Tires will tell you what they like and don't like. If they howl in corners after a pressure change, they probably don't like it.
