I think J is at the tail end of her selfie phase and it is not a moment too soon. Any time I left my phone unattended, I would come back to find a ton of selfies in the photostream. It went from being cute to annoying very quickly. Tweens would appreciate the selfie mirror I am sure but it would take their narcissism to whole another level.
Pose in front of the mirror and broadcast yourself to the world by way of Twitter - this is huge improvement over their current experience. It would make sense then to perfect the look by airbrushing the image.Such a value add would eliminate awkward selfies entirely. The only redeeming quality of the selfie was its awkwardness.
It would be good to have the camera refuse to take any pictures of our kids until all their chores were done. A mommy override button would make a world of difference to this otherwise frivolous product.
There are times when removing awkardness can be a good idea - a coffee machine that refuses to brew until two strangers have connected by a touch screen, for example