Knowing which styles are active on which device

Is it not a novel idea to show an icon indicator next to the various elements in the navigation tree that tells which devices the element is visible on? Yes you can perhaps name elements to indicate, but if you copy elements and add nested styles for the device, its not easy to tell if you change the active device for the element unless you go into the settings panel.

Appreciate that devs have a long wish list to parse through and I apologize if it is already on the list. Unfortunately I just don’t have the time to research.