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Why on earth would they migrate away from the Mach kernel and OSX/iOS?

Because nothing lasts forever. Take a look at what Harmony OS is capable of if you want to see what a modern take on an OS and ecoystem looks like. It sure isn't the pinnacle either.

Can you give a brief comparison? I'm not familiar with Harmony OS and wouldn't know where to start on comparing the two.

I found out about it through this guy and his videos, they are slow but in depth: https://www.youtube.com/watch?v=GSLFz4jTMEY

There's no reason for Apple to migrate; none at all. The idea that they need to do so is just ridiculous, regardless of what Harmony OS may do. iOS/macOS does exactly what they need.

Will things change? Perhaps if/when quantum computing becomes a bigger item.

The people who designed Mach in 1985 would almost certainly design something very different if they had today’s hardware, AI agents, secure enclaves, NPUs, ubiquitous networking, cloud edges, wearables, smart home devices and generally device density per person.

HarmonyOS is interesting because it points at the right axis: one coherent OS fabric across many devices, not a set of separate device OSes glued together by continuity features. Continuity, iCloud, Handoff, AirDrop, HomeKit etc are impressive glue. They are not the same as one logical OS fabric.

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