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Keep an eye on the Connected Home over IP project;
https://github.com/project-chip/connectedhomeip
There seems to a growing consensus that it will be a major unifying force in home automation.
Amazon doesn't play nicely with either Google or Apple smart home devices... the on-paper compatibility doesn't seem to translate to the real world.
Not that Apple or Google play nicely with Amazon too... a Nest Hello doorbell equally does not integrate with Alexa particularly well (I believe it didn't for about a year, but recently limited support may be back).
The way this is playing out means you need to pick a horse to back: