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It's _always_ easier to simply drop support for legacy. And can often result in real savings in other ways, such as security and hardware. Apple, being a closed system, has no real compelling reason to want to provide legacy support -- they want you to buy new.
Microsoft faced this when they moved to 64-bit Windows. They dropped support for 16-bit apps, but supported 32-bit apps (and, in fact, continue to ship 32-bit versions of the consumer version of Windows to this day.)
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