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Home Assistant officially Matters
(www.home-assistant.io)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Besides that, Thread is pretty low-bandwidth and low-noise. It's designed to sip battery life from devices.
2.4Ghz just allows it to be built into tons of devices without an extra chip. Every Google Hub, Alexa, or Apple hub supports it.