1. I've read that rooting breaks Android's security model, but I have yet to find a detailed explanation of how it actually lowers Android's security, especially compared to desktop OSes that are usually rooted, like Linux or MacOS.

2. Software kill switches are prone to software attacks, aren't they? They can't be as secure as hardware kill switches unless we can prove the software kill switches can't be attacked by software. I doubt anyone can prove this.