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> Swift embedded, for example, is a sort of proof of concept more than viable platform, and you end up battling that more than the problem you are trying to solve.

Yet Apple has managed to create WatchOS. I don’t know what is the portion of Swift, however.

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WatchOS is hardly embedded though. An Apple Watch is basically a small iPhone tied to your wrist in terms of architecture. That’s got a whole lot more in common with a full desktop computer than it does with a microcontrollers, where they often have rather weird architectures by desktop standards, and it’s quite rare to have MMUs and things like that. Also, there is no underlying OS, and no heap allocator (unless you provide one). That’s the kind of challenge that an embedded language runtime has to provide.

Which might be one of the reasons why battery lifetime on Apple Watch is so bad.

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