Add my vote
every time i see someone say this, i flinch.
and this is the reason for that flinch.
"racial interdependence" should mean community activities and goals (community crafting, major events such as blight invasions, etc) require the participation of both Dragons and bipeds. It should not mean that basic game-play mechanics (including ability questlines, btw) requires the intervention of a player of a different race.
While we have had a few examples of the former, we have several glaring examples of the latter, and, despite the insistence of devs that it will change, the latter all goes one-way.