Zigbee already filled it's space as a solid meshing network, and wifi took the "no hub" solution and worked well enough for most people. The radios for both, e

Zigbee already filled it's space as a solid meshing network, and wifi took the "no hub" solution and worked well enough for most people. The radios for both, especially with the esp8266 were very cheap before bluetooth was at all. Then all the big players started working on defining Thread/Matter which was in many ways the successor to Zigbee (or is positioned to be).