When Matter came to Hue I immediately did the update from Homekit and got everything set up again. The first annoyance was that my Motion Detectors became unusable. For some reason they were no longer “Motion Detectors” but instead became “Occupancy Detectors.” This meant my old automation that turned on the light in a hallway when I opened the door stopped working entirely. I had to revert back to the Hue app and set up the motion detector automation there instead.
A minor annoyance, but alright, whatever. I added all my lights, set-up my rooms, set-up my scenes and automations.
Six weeks later, all my lights reset to the default rooms. I lost all my automations, scenes, and had to set-up the whole thing again.
Four weeks on from that, half my lights disappeared from Homekit. Couldn’t re-add them. Bridge was there. Other half of the lights worked. Had to set-up the whole thing again.
Another month and a half later, my Kitchen light vanished from Homekit. Again.
Luckily, you could still revert the Hue Bridge back to connecting through homekit instead of Matter.
Not sure if it’s Apple‘s fault or Signify’s fault, or maybe both, or maybe neither and it’s just the standard that’s ****. But never again, they can stick Matter where the Hue lights don’t shine.