It's usually all good until you leave the truck out in the blistering 99 degree heat and the temps inside are blazing and everything is heat soaked. You'll swelter while it struggles to cool down, if ever. I've had to resort to the hack once temps get hot here in GA. I've pretty much stopped complaining about it and just accept it for what it is.
Plenty of folks say they have no issues, and I can believe it. If I leave my truck parked in the garage and run out for some errands and then come home, it's no problem at all. It was cool when I left the house, didn't leave it out in the sun to heat soak long enough at any stops, and returned home nice and comfy.
I also think the Pano Roof isn't doing any of us any favors.
I believe it really all just depends on driving habits and there could be some variances between trucks as well....but I kinda think it's habits. Most folks that measure their vent temps seem to be getting consistent results in the upper 50's to low 60's and the folks that tend to say they have no issues never bother to measure the temps. I suspect if they did measure the temps, they'd not post them as to not have to eat crow. They tend to get very defensive when asked about their temps. Always seems like strange behavior to me, but to each their own.