matter and thread are different things fyi…

thread uses the same wireless communication as zigbee (zigbee has other stuff on top of it), so is a low power wireless protocol

matter is the data format that devices use to communicate on top of an IP-based network like wifi or thread. it’s meant to standardise all these competing “works with google” “works with alexa” “homekit compatible”: if it works with matter, it should work with any coordinator that has matter compatibility (which all the big ones do these days)

thread will work great if the wifi is down - same as zigbee!

matter also (afaik) forces local devices: your coordinator (a homepod, alexa, etc) talks directly to the device without going through the internet. again, same as zigbee