Many IoT usecases (security cameras, baby monitors, drones etc) use unidirectional media
Unfortunately the trend in the current specification is to force such media though a TURN server since
that is the only usable candidate that will be generated without a GUM permission.

The costs (and latency) of running every video camera through TURN would negate two of webRTC's main advantages in this product area.

srflx and host ICE candidates should be available to this usecase in a way that isn't bemusing to the user.