Mesh doesn't need to be limited to Wifi. The only reason purely radio-based mesh networks are difficult is interference. With enough intermediate wired links in

Mesh doesn't need to be limited to Wifi. The only reason purely radio-based mesh networks are difficult is interference. With enough intermediate wired links interacting with the network (i.e. 3 or 4 Wifi hotspots route to an entire apartment high-rise), the problem is trivial, and hierarchies can be generated based on link capacity and topology just like with the Internet (BGP/RIP). This requires updating routing protocols and in some cases, infrastructure, so there's a lot of hysteresis against change (I know; I've tried).