A frustrating element of running a smart home is having to climb on ladders every 3 to 6 months to swap out CR2032 batteries or rip down your sensors to plug them in. Realistically, the reason behind this is that retail starter kits push cheap Wi-Fi sensors that wake up, spin up a full TCP/IP stack, perform a DHCP handshake, open a TLS session, and ping a cloud server every time a door opens (burning through a tiny battery in months).