Physical switches typically are a lot harder to circumvent and a lot easier to verify than software ones. > Here, we would need to expect an electronics engine

Physical switches typically are a lot harder to circumvent and a lot easier to verify than software ones. > Here, we would need to expect an electronics engineer to understand (from looking at a disassembled device) that the switch actually does what it says it does, right? Sure. This is a lot better than just trusting a manufacturer's word, since they have an incentive to hide vulnerabilities and independent researchers have an incentive to publish them. Having designs available makes their work a whole lot easier and potentially lowers the barrier of entry so much someone with some interest and time could do the checks themselves. The more eyes, the better.