I am also invested into Z-Wave with about 50 devices. It works well, doesn't require an Internet connection, degrades gracefully if the hub is unavailable (or i

I am also invested into Z-Wave with about 50 devices. It works well, doesn't require an Internet connection, degrades gracefully if the hub is unavailable (or indeed any RF) and Z-Wave JS UI is good enough for self-hosting and bridging to MQTT for full integration with anything else I want. The protocol is also excellent for battery powered devices in terms of super low power consumption: depending on the device's needs, the protocol allows for the device radio to be completely off for hours at a time. For example, I have a couple of key fob controllers that we use daily but we haven't replaced the batteries in them for years. My only fear is that "consumerist" IoT platforms that change every few years will usurp it and new Z-Wave devices will become unavailable.