After glancing over the title I first thought the topic is physical microphone kill switches. That being said

We need physical microphone kill switches.

Even if you are super careful about getting your laptop infected or hacked, you have probably tons of legit software installed on your laptop that can be hacked, or spy on you for purpose, there are OS and vendor backdoors, zero days, and many of us use laptops managed by our corporate overlords.

I wish that microphones (and cameras) in your private space that are connected to a network and a battery would be taken more seriously.