It's worth noting that Nest is using (likely heavily customized) Linux, pretty hard to keep sync with the upstream due to its monolithic kernel architecture whi

It's worth noting that Nest is using (likely heavily customized) Linux, pretty hard to keep sync with the upstream due to its monolithic kernel architecture while doesn't get aggressive investments like Android. But lifespan expectation for those products is much longer (~10 yrs) than typical smartphones (3~5 yrs) which leads to more maintenance headaches as Google accumulates their product portfolio, even compared to Android And... Even notorious Google couldn't completely pull their hands from Nest Secure although they decided to discontinue its production and sales. This is probably the problem they want to solve with Fuchsia. In this context, using Fuchsia is a pretty natural engineering decision. Fuchsia team can onboard its first customer while Nest team can outsource lots of its maintenance issues to a more appropriate team. I guess they already consider using Android before, but probably that's a no-go option since its support usually ends before 5 years. Of course, Android and Chrome OS have completely different needs and environments, so I don't expect them to converge to Fuchsia in any foreseeable future. More likely scenario would be a shared ecosystem based on Play Store which enables more future strategic movements.