[posborne]

The agnosticism may be refreshing for some use cases but for things like interoperable home automation the lack of an application layer associated with thread makes it useless to design into a product at this point as there is no real open ecosystem around the technology.

The fact that ZigBee (application layer) requires data to go through a gateway via a standard before hitting some server on the internet is probably a very good thing for pushing interoperability. What you see with IP bulbs is that each bulb hits its own servers on the internet -- when that business disappears in a few years, the customer is probably SOL.

ZigBee app layer on Thread (DotDot) will probably be pushed more. Just a question of whether the advantages of Thread over Zigbee (3) will have enough benefits to push ecosystems like home automation to switch over to this stack.