I see the DD as coming from the same school of thought that brought us "lawyer lip" forks, various annoying wheel-retaining washers, turkey levers, chain guards, flags, kneepads, safety vests, mirrors, etc. All promising to deliver a safer, virtually "idiot-proof" cycling experience but mostly failing in everyday use.
If you let these people go too far, we'll eventually have mandatory rubber tooth guards on all bicycle stems (to keep from chipping your tooth) and top tube padding, on every new men's bike sold, to prevent reproductive damage.