For those of you who have come of age (running-wise) in the 1980s or 1990s, you would have a hard time understanding this deabte about all the "technology" on shoes.
When I was running 70-85 miles per week in HS (1970-73), I wore the Tiger Cortez, which was nothing more than a simple leather upper with maybe an inch thick of cushion foam (of some sort) on a rubber sole. The shoe had NO technology. I never got hurt! Racing flats were a quarter inch rubber sole (no cushioning) w/ a nylon upper (Tiger marathon). I used to do 15 mile runs in Tiger Jayhawks without any problems. As far as I know, everyone of that era did the same thing (Pre, Virgin, Chapa, Salazar, etc.). Hell, the shoes Lindgren and Ryun had were even more simple.
In the 1980s, it became harder and harder to find a simple, no frills shoe (Nike Daybreak was pretty good). I agree with Lydiard. the vast majority of runners have way too much shoe on their foot.
I think the constant addition of technology (more shoe, and stupid-ass gimmicks), is the effort by shoe companies to capture market, sell more, and justify huge R&D budgets.