If by proper riding you mean not minding where you ride and treating your material with utter disregard, you might be right because I doubt I'd have been able to ride an entire summer with them if I rode through piles of broken glass on every ride. But then I have yet to find a tyre that will put up with that kind of abuse. The summer/winter argument doesn't apply, streets ain't sharper in winter or something.
If by proper riding you mean not minding where you ride and treating your material with utter disregard, you might be right because I doubt I'd have been able to ride an entire summer with them if I rode through piles of broken glass on every ride. But then I have yet to find a tyre that will put up with that kind of abuse. The summer/winter argument doesn't apply, streets ain't sharper in winter or something.