In my experience, Matter is okay except that it’s built over IP and manufacturers seem to be unable to resist using that juicy IP connection to talk to the Internet.
Thread should not have allowed Internet connectivity by default.
My Brighter lamps don't connect to the internet. But, the smart features don't work properly, so maybe they're just shot in general.
My Brighter lamps don't connect to the internet. But, the smart features don't work properly, so maybe they're just shot in general.