[stavros]

The main reason why I love Zigbee is that it doesn't support full IP networking. It's about broadcasting standard messages to all the devices, like a message queue, and that's fantastic for the use case.

No firewalls to worry about, no external access, nothing, just all my devices automatically communicating with all other devices.

[ianburrell]

The downside is that need hub and its app to talk from phone to device. Matter using IP means phone can talk directly to device. Thread is separate network and needs bridge, but that can be simpler and generic. Thread/Matter use uncountable IPv6 space.