The front-facing camera in smartphones and tablets have made it incredibly easy for people to take selfies. However, the resulting image is inaccurate. It is reversed, as if viewed in a mirror. When you send the image to others, you're essentially saying, "Look at how I perceive myself," not "Here's how I really look."
If the images from a typical digital camera were to come out the same way as those from a front-facing smart phone camera, everyone would complain. Lettering would be reversed. Folks would appear to be saluting with their left hands. A photo of Michelangelo's "Creation of Adam" would have G-d on the left.
The designers and engineers of these devices could have corrected this distortion simply by mirroring the image before creating the file. Why didn't they?