The Incarna “scene” is primarily a few groups of gamers in the Seattle area. One of the common threads is the basic desire to follow the Open Gaming Model.
Honestly, this is very subjective and the source of many arguments. We will just say that Incarna is supposed to stress and promote Role as opposed to Roll. Its tuned to the sensibilities of the gamers in the scene here, and you may not get the same effect.
See also “The Role of The Dice: Middle Ground” 5th Ed. DMG p.236.