An exception to that rule is if they have hardware switches for turning off the power supply to the camera and microphone.
Currently, I am very happy with my Framework, where the LED is hardwired into the power supplied to the camera[1].
[0]: https://en.wikipedia.org/wiki/Optic_Nerve_(GCHQ)
[1]: https://community.frame.work/t/how-do-the-camera-and-microph...