@rachel I get where you're coming from, as I isolate my wifi IoT stuff on a VLAN, and Thread doesn't play nicely with that unless you put the border router on a VLAN too (which, given the nature of border routers, is unlikely to work out well).
But I profoundly fucking hate 802.11 as a home automation standard. It's profoundly unsuited to it and I am backing away from it anywhere I can, and unlike Zigbee, Thread actually seems to work properly in an environment with multiple manufacturers' gear.