I think the parent was talking about so far vendor-specific solutions for 802.11. 802.15.4, meant for low-rate, low-power applications, is something completely

I think the parent was talking about so far vendor-specific solutions for 802.11. 802.15.4, meant for low-rate, low-power applications, is something completely different. This standard doesn't even compare remotely, regarding applications (you will never be able to watch a youtube video over 802.15.4) or how it works internally IMO. Even the definition of what constitutes a "mesh" is considerably different.