Access to useful wireless bands for mesh topologies is a hurdle. The unlicensed bands (e.g. wifi) are such precisely because they're generally junk w/r/t to propagation and atmospheric absorption. The licensed bands are unsurprisingly gated by license holders in a way to enforce exclusive access, which often does not correspond to full utilization of the available bandwidth. Especially so with license holders than just squat on their bands indefinitely.