Apple seems to be taking steps in that direction https://www.apple.com/mac/docs/Apple_T2_Security_Chip_Overview.pdf https://www.apple.com/mac/docs/Apple_T2_Sec

Apple seems to be taking steps in that direction https://www.apple.com/mac/docs/Apple_T2_Security_Chip_Overview.pdf https://www.apple.com/mac/docs/Apple_T2_Security_Chip_Overvi... All Mac notebooks with the Apple T2 Security Chip feature a hardware disconnect that ensures the microphone is disabled whenever the lid is closed. On 13-inch MacBook Pro and MacBook Air computers with the T2 chip, this disconnect is implemented in hardware alone, and prevents any software—even with root or kernel privileges in macOS, and even the software on the T2 chip—from engaging the microphone when the lid is closed. (The camera is not disconnected in hardware because its field of view is completely obstructed with the lid closed.)