> If an attacker is at the point where they can turn on your microphone, or video, it doesn't really matter anymore, it's been game over for a long time.

This is obviously incorrect.

There is lots of software that can get access to your camera/microphone but not have access to anything else, like browser-based applications. And on Mac even locally installed applications are limited; getting access to user data directories requires a separate permission grant from webcam access.

You might also simply have nothing incriminating on your machine.