On Via Ferrata you use lanyards specially designed for via ferratas! It's logical and more importantly, it's for your life! These include two carabiners with a two-finger opening system.
We don't want you to climb with two basic carabiners and static lines. This is crazy, ok and the best way to have an accident or to even die! Either you or the carabiners will brake. It already happened and it brings a bad image for the via ferrata world!