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It's a good reason from Apple's perspective, they have all this "legacy" software not distributed through the App Store. A new processor means everything needs

• 8fingerlouie 7y ago
  It's not what they "typically" do though. When they switched from the old PowerPC architecture to Intel, they provided emulators, and _IF_ you use Apple's libraries, a simple recompile of your app would often be enough. While some people see it as restricting them, Apple mostly works hard to make their libraries do whatever people needs them to do, but at the same time they keep control, meaning moving to a new architecture is as easy as Apple fixing their libraries, ship a new version, people recompile, and done.
• reacharavindh 7y ago
  Exactly. Apple may just want to replicate the ios Appstore experience on the new Macs and collect the 30% rent on _all_ software to be installed in them - that's what I said I will run away from. Technically ARM is just another CPU, so compiling stuff to it is not a technical problem although an opportunity for Apple to get greedy and call it "the most secure OS ever" :-|