That would literally kill the whole point of being able to find it if it's stolen. I know there are other ways to do it (a sophisticated theif might just put i

That would literally kill the whole point of being able to find it if it's stolen. I know there are other ways to do it (a sophisticated theif might just put it in a Faraday Cage), but Find My would just work in its current form otherwise, and putting a physical switch that physically switches it off kills the whole purpose.