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I would also bet the already have full macOS running on ARM internally. I think we are seeing the proof of this in the new libraries being released to support the iOS like apps (News and Stocks) on the Mojave.

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Why do you think they rewrote from scratch all the applications they acquired from 3rd parties like Final Cut, Logic?

You don't need to rewrite them from scratch. They've had those companies for years and it's a good bet that they've done work to make it more portable. It was already available back when Macs were using PPC, so the code is obviously somewhat portable.

Perhaps they didn't need to, but they did anyway

When they transitioned to Intel they even said they had internal Macs running on Intel for years waiting for this day.

Did somebody here get one of these back in the days? https://forums.macrumors.com/threads/apple-development-trans...

AFAIK, they essentially "just" maintained the x86 port of NeXTSTEP throughout the entire migration from NeXTSTEP to Mac OS X.

I wouldn't be amazed if they supported big-endian PPC still for the sake of maintaining portability, though I feel that's less likely than little-endian ARM.

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