Zigbee mostly uses 2.4Ghz, so it's not helping remove congestion from that band anyways but I guess the other protocols do. Can't the devices phone home as soon as they're connected to a hub that's internet connected? Even if the hub has to cooperate with the device, they're made by the same manufacturers so I wouldn't trust tleither of them.
With wifi I can spin up a separate iot vlan that cannot access the internet. That vlan doesn't require my ISP, it's entirely local. I get to control exactly who connects and even who they connect with. I don't see that same control with the alternatives.
I guess I do see an argument for very low power devices using a lower power protocol, but I guess I just don't have any of those devices so it hasn't been an issue for me. And like you said traffic congestion is a valid problem, I've just never experienced it.
Zigbee mostly uses 2.4Ghz, so it's not helping remove congestion from that band anyways but I guess the other protocols do. Can't the devices phone home as soon as they're connected to a hub that's internet connected? Even if the hub has to cooperate with the device, they're made by the same manufacturers so I wouldn't trust tleither of them.
With wifi I can spin up a separate iot vlan that cannot access the internet. That vlan doesn't require my ISP, it's entirely local. I get to control exactly who connects and even who they connect with. I don't see that same control with the alternatives.
I guess I do see an argument for very low power devices using a lower power protocol, but I guess I just don't have any of those devices so it hasn't been an issue for me. And like you said traffic congestion is a valid problem, I've just never experienced it.