Maybe if you're in goathead country, or some other place where the main reason for flats is fairly well calibrated in size.


As a general recommendation, I beg to differ.
The number of flats I've had that has made me think "2-3 mm more of rubber would have saved me from that" are VERY easily counted.
And I've been doing 6000+ miles/year for ages.


My main identifiable reasons for flatting is either the crushed up stone flakes used instead of sand in winters, or those sneaky pieces of steel wire coming off worn truck tires.
It'd take a HUGE chunk of rubber to provide fully reliable protection against those.
Last stone chip could have been mistaken for an arrowhead and would have gone through 12 mm at "ideal" alignment.
Last wire flat would have been able to pierce an 8 mm thick tread section.