I think people have forgotten about Google Fuchsia which I guess is a good sign for a new OS. They’ve done quite well in deploying it seamlessly to their consumer devices.
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Still a very interesting project, but that feels like a similar story, for limited use cases (a smart thermostat/speaker with specific hardware) it works, but for wider use cases with heterogeneus hardware and complex interfaces (actual screen, peripherals) it didn't work.