I have suddenly been curious about matter and reading up on a lot of terms…border routers, edge routers, matter controllers, matter bridges, thread, mesh. I percieve, for example, that (at this point) alexa border router/controller does not automatically link to a google router, but an alexa border router can share individual matter devices with a google matter router. Thread and wifi are, of course, different. From what I have read about the ISY, my,perception is that matter (wifi) devices will iintegrate natively with IoX. Matter (thread) devices will integrate only via a nest hub (gen2j or apple home. Interestin to me is that they did not mention any thread enable routers from amazon.
I am also assuming that, at this point, IoX is not exposing nodes to other matter controllers via a matter interface. For now, I am assuming that this will still require a portal account. Maybe this will change in the future.
Maybe my assumptions and perceptions are all wrong.