First off, car tires have much larger contact patches. Motorcycle tires only have 2 tiny ones. Those 4 much larger contact patches cover more of the same road surface. What looks like gravel to a Corvette tire will look like large rocks to a motorcycle tire.
Secondly, car tires can afford much larger slip angles and still be stable. In fact, some cars under some conditions actually corner faster with much greater slip angles. On a bike, unless you're extremely talented flat tracker, excessive and/or abrupt slip angles to the average K16 rider = low or high side.
Thirdly, car tires also have much more substantial carcasses with more and heavier belts/plys, necessary because of the much larger weight bearing load. Motorcycle tires are baloon thin in comparison.
Fourthly, those traction test are likely done on smooth track surface. And car tread depth are far thicker than motorcycle cycle tires. Even shaved, those Corvette tires likely are still thicker than a brand new motorcycle tire. Certainly orders of magnitude tougher.
Fifthly, I said higher tire temp - not producing more heat. A worn out tire will still produce heat, which is actually mostly from carcass flex. Problem is that there is much less material there to absorb and transfer that heat, leading to localized hot spots, which can be detrimental to tread stability.
Lastly, if shaved tires are the way to go for better performance, all the motorcycle racers will be running them. They don't. Motorcycle DOT race tires have limited tread grooves because that is the minimum for being DOT legal. If you look at racing slicks, their tread rubber material are as thick as DOT racing tires, which are not far off road (sport or ST) tires.
You were arguing that the tread depth. Now that the supposed benefits of tread depth were shot down, you change your argument. OK.
Another thing about worn tires is that the less tread material there is, the more problems you introduce:
For most folks, the tread depth is the only visual indicator they have of how much tread material there is on their road tire. But at the end of the day, a worn tire is a worn tire, whether it is a racing slick, DOT race , or road tire. So ultimately, it is the amount of tread material left that matters. You would think that is understood easily enough. Perhaps I should've dialed back on my expectations.
Is there really a "prime season" for straight, non curvy or hilly roads?
Aww, c'mon now. That's a low blow.
Yeah... that is yet another reason I change out tires so often. Wearing a flat spot down the middle is unfortunately a fact of life down here. Expensive tires would be a waste of money. Still, it's a small price to pay to be rolling on 2. And I do try hard to keep the price small.
That said, there are some good roads to be had a little ways out. I'm heading out to the Hill Country this long weekend. Perfect weather!