I don't know much about Fuschia. I'd be surprised, though, if updatability wasn't a major concern. Part of why I don't know much about it, though, is that AFAIK it's 64-bit only, and the MCUs we run are 32-bit affairs.

Okay, so NEST is 64-bit, apparently -- 64-bit IOT. I can see 32-bit at Fitbit.

Google's big argument to say they aren't upgrade pixels, is that they can't guarantee security of binary blobs. Fuchsia does nothing to help this.