Originally Posted by mxmx
This is a poor excuse of reverse psychology though. "The shoe is faster, so it has an excuse to wear down?" "It is very durable, so it does not need to be comfortable?" - lame excuses. It seems as if companies are sometimes abusing this...If this was not the case, newer models would actually always improve, and not get worse.
Durability requires denser and thicker rubber compounds which are naturally heavier. It also requires thicker and better reinforced materials for uppers which are also heavier. Thus, you can't make a shoe that has maximum durability while having minimum weight at the same time. That would be like making a sports car with a 6.0 liter V-12 engine that has 600HP but still gets better gas mileage than a Prius. You can't have both.