> I don't particularly see the point of kill switches when you trust the software.
In my view it's two things: 1. It's defense in depth. No one person will ever be able to review every single line of code running their device, but anyone can crack open the case (and/or check the open schematics) and verify that flicking the switch kills the microphone. And 2. The baseband still has proprietary code running it that you can't verify so the only reasonable thing you can do to it is power it down.
