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another protocol/wireless stack? Why can't we settle down to something that is at least "good enough"?

Because zwave is proprietary. There's money to be made here! Can you imagine the lost profit potential if people standardize on an open protocol like ZigBee?

It is so proprietary in fact all of the spec is on github:

https://github.com/zwave-js/specs

Even with a spec on github, a protocol can still be proprietary, e.g. if companies have to pay to use it legally in products

Try to build a device and not pay the tax stamp.

You can see it in products like inovelli where zwave is always more than zigbee.

https://inovelli.com/collections/z-wave-light-switches-red-s...

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