Actually, Apple has stated that Matter is based on HomeKit’s framework, and will utilize Thread and WiFi/Ethernet as the primary communication mediums.
I would love to see a Rachio 4 with HomeKit/Matter support via Thread. I’m not sure you could get away with NOT including Bluetooth for setup, and TCP/IP over WiFi is pretty much a given these days. Wired Ethernet with PoE would be excellent, I think we should be utilizing wired connections a LOT more than we typically do these days. Especially for devices screwed to the wall/ceiling. If only new home construction included CAT 6 runs as standard instead of (or in addition to) coax.