you missed the point and you're wrong. light switches complete a circuit when on, they find a neutral [or return] when on, when off they interupt that return, whether that's a correct or incorrect wiring method can vary.

an always on device requires a neutral OR alternative power. this means smart switches, smart thermostats, automated function devices.

if this were a multi phase wiring install that COULD differ.

please don't input incorrect or half right information. yes lights get the neutral passed to them, but convention has changed if you intend to automate. you're fully right if this were 1990 again.