It's important to keep in mind that while it seems to be approached as "simulating" the effects traditionally achieved with mechanical effects of a camera, it has a basis in fundamental optics. Creating a sense of focus in a portrait with a camera lens is analogous to how the optics in our eyes work. Thus, this particular effect is more natural than some of the more Photoshop-esque techniques.

A good example of "what else" might be the color pop feature in the Google Photos app. It uses the depth information to selectively decolor the "out of focus" portions of the photo: https://www.androidpolice.com/2018/05/11/google-photos-color...