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by dns_snek 896 days ago
"Work offline" and "You can still buy" are satisfied by looking for Zigbee, Zwave, or Thread/Matter based devices. These don't connect to the internet by design and require an inexpensive dongle to form a mesh network. In very few cases WiFi devices with local HTTP API or MQTT are perfectly fine as well, a good criteria to look at is whether Tasmota or ESPhome (alt firmware) list support for them.

"Fail normal" would be trickier, I don't think there's one size fits all. For lights, prefer switch relays over smart bulbs. Look out for customizable "default" state when power comes back on.