If it is important, then if wifi/ethernet out then it should still work. So my doorbell used to have a link to a mechanical chime (Doorbird), the current Reolink jobbie does not but it is PoE and all my switches have UPS. The Reolink does have a separate chime that plugs into a power socket and a way better camera.
Oh and none of my home things ever get unfettered access to the internet. I have two VLANs for IoT: things is for most devices and sewer is for those that scare me somewhat.
I treat the whole thing the same way I do corporate IT and I do point Nessus at it. I have several Home Assistants that I look after - home and work and several customer ones too.
The OP's choice of smart plug is clearly designed to be mildly inconvenient to get at but also reliable. I'll put money on there being a monitoring function too.
That's a nerd that does things "proper like".