As so eloquently said by Sir radman, there are a huge number of surprizes waiting for us on the tarmac: gravel, diesel fuel, tar pythons, powerline truck stopped just around the bend. Surprizes are only good at Christmas and birthdays. They are no good on motorcycles.
I have come across so many of the above that I refuse to ride 10/10 on the road. I want plenty in reserve. On a ride last week, there was gravel dragged out from scenic turnouts on probably half the twisties I rode.
Here is my bike at max velocity without any tire wear at all.