The two photos they showed to demonstrate the depth of field effect looked absolutely terrible. The edge of the mask was extremely blurry. It looked like something you could create in a photo editing app in a few seconds by just drawing over the background with a blur brush.
That is pretty much exactly what's happening, minus the manual brushing.
A depth map and face recognition is used to locate the foreground subject and a heavy blur filter is applied to the background layer. For the same reason we don't have software today that does perfect (or even halfway decent) automatic masking of faces, the edges become a blurry mess. You don't get any of the beautiful out-of-focus point of light scattering, because the lenses are incapable of capturing it.
