I have followed Apple architecture since the 128k Mac and the Lisa. They have studiously avoided breaking all apps at the same time. To wit, the 68k to Intel mi

I have followed Apple architecture since the 128k Mac and the Lisa. They have studiously avoided breaking all apps at the same time. To wit, the 68k to Intel migration for many was recompiling with Xcode, and some code review per Apple guidelines. They actually went to great lengths to give you tools to ensure your migration went as smoothly as possible, where the OS interface was concerned. ARM: Lather, rinse, repeat, or not, if you are satisfied with emulated performance.