I believe that it is considered pretty taboo by the industry other than for bikes set up that way stock from the factory. That said, I think that prudent and vigilant, experienced veterans, like Ken, can get away with it because they are very performance oriented and they know that proper maintenance and oversight goes along with that particular turf.
The roads overseas are supposedly paved with diamonds, especially in NZ and Oz, or so we've been led to believe, and that (coarser aggregate), more than anything else would account for the shorter tire lifespan, unless, that is, those blokes are actually as crazy as they seem!