IoT devices (except something like NVR cameras) uses very little bandwidth and little time, so why you need 5GHz? 2.4GHz is better for range, all AP/Client sup

IoT devices (except something like NVR cameras) uses very little bandwidth and little time, so why you need 5GHz? 2.4GHz is better for range, all AP/Client supports same frequency on worldwide, cheap, and so on. I suspect that there are few reason to implement both 5GHz and 2.4GHz for IoT devices. Supporting all 5GHz band would increase cost. https://en.wikipedia.org/wiki/List_of_WLAN_channels#5_GHz_(802.11a/h/j/n/ac/ax) https://en.wikipedia.org/wiki/List_of_WLAN_channels#5_GHz_(8...