This thread has a lot of people arguing for the live visuals use case over protecting privacy or vice versa. Not only are they both important, but I think we can actually have both.

To easily solve both the privacy and the live visuals issue, Apple should make it so that the dot is only shown on a display of it is:

- the primary display (the one notifications appear on, since that's where the user typically checks for system status),

- the built-in display, if any,

- the display the cursor is on, or

- the display containing the frontmost window.

These are the only kinds of displays that make sense to have a persistent privacy indicator on. Anyone who's sitting at a computer is looking at at least one of these displays.

The secondary displays that artists use to show fullscreened live visuals always fit none of these criteria.