Technological development = scraping perfectly fine frames?

In the past I must have thrown away dozens of rims, nearly all smashed up or badly dented, just one or two because of brake wear - it does happen, but assuming the brake blocks a cleaned promptly when they pick up swarf, it's an unusual cause for scrapping a rim.

three years of daily london commuting and a season of cross will do it. i'm really not sold on the stopping power of disc brakes (is it just me?), but rim wear is a real thing.