If the Decora Smart® Wi-Fi Bridge (MLWSB) is unplugged the DN switches or dimmers will continue to manually operate, schedules will continue to run and 3-way control between an Anywhere Companion and DN switch or dimmer will continue to work.
A missing bridge will impact Homekit, app control, and all cloud connections including voice control of the DN switch or dimmer. When power to the bridge returns it will automatically reconnect to the DN devices, Homekit (if applicable) and the My Leviton app and cloud.