xbee3 (xbee with ZigBee3 protocol) together with Home assistant seems like a perfect match. Potentially you can control all sorts of device brands, without the need for extra hubs and/or in between protocols.
Zigbee and Home-assistant are both opensource and very interoperable and expandable. Devices are way cheaper than z-wave. Why is this not supported? And what can I (a non-programmer) do to make this happen?