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SurferRosa Nothing wrong with Duopars. Not many mechs can compare to the chain wrap capacity of an Eco or Titane. Nor is the Eco (steel cage version) even that heavy for a nice long cage touring derailleur.
Also, if you really do throw all steel components in the trash, there would be quite a few Campy and Suntour mechs in the trash as well. Read up on Disraeli Gears and you'll see the nicer rear mechs didn't start going to alloy bodies until the 60s/70s. Even then and still today, rear and front mech cages are still made from steel as it is an application that requires it. No use making blanket statements throwing things in the trash.