I’ve used HA for a long time. When my fourth SD card said goodbye I switched to Homey Athom.
I still miss HA and my question is: Can I setup all (z-wave/zigbee) units in HA without interfering with Homey? Eg. a dual setup. Keep in mind that my wife don’t necessarily would love that the automations suddenly stopped working.
This is true that there can only be one primary controller to add/remove devices, etc, but you technically can add a “secondary controller” in zwave to an existing network, which will let you control some devices, but won’t work with locks or secure devices (it doesn’t have the “keys”), and usually won’t give you status updates on devices either. So I’m not sure how useful it ultimately would be to try out.
I know this is from the Smartthings forum, but this post gives a very detailed overview of how it works.
Does Homey support MQTT? Then you could setup zigbee2mqtt and zwavejs2mqtt, everything will then be published to an MQTT broker and can be read/controlled from as many systems as you want.