Home Assistant is practically already there. While installing it initially might be technical, these days they also sell things with it preinstalled. After tu

Home Assistant is practically already there. While installing it initially might be technical, these days they also sell things with it preinstalled. After tuning on HA for the first time, it just recognized our heating system (Plugwise, it's also zigbee but custom/closed), Christmas Tree lights, Smart Reader of our Electricity & Gas (as in district "propane"), Foscam and Reolink cameras and doorbell ...etc. All those things just asked for username/password set for that service/device and everything just worked. And actually controlling of things like TV (well Chromecast part of it that's built into) just work without authentication. And while Zigbee Coordinators required some flashing of firmware updates. From there on it was very similar to any other smart device system.