Chilling effects, for example. Children know they are under permanent surveillance, and will act accordingly - like not doing something in anticipation of admon

Chilling effects, for example. Children know they are under permanent surveillance, and will act accordingly - like not doing something in anticipation of admonition. The parents on the other hand have an always-available magic mirror to show them what their children are doing. Depending on your desire for control, this may very easily lead to checking in ever-shorter time intervals.