I just saw an interesting post on c|net about Matter Alliance. Apparently it is a consortium of companies to bring interoperability to smart home devices. It has major players like Apple, Google, and Amazon involved.
It's interesting because in addition to having the right companies involved, it is also open-source. I guess this has roots in project-chip (connected home over ip) and Zigbee. I'll need to read up on this - hopefully it will be useful. It would be nice to have interoperability and if I could do my own customization that would be awesome!