There was less software running on PowerPC than x86 back then and still there's less software running on Arm than x86, especially the key ones like professional ones (above all, Adobe suite, AutoCAD, Blender, Ableton, etc.)
Arm chips might even be faster for Apple, but MacOS X unfortunately isn't as castrated as iOS and power users will refuse to give away that (small) liberty available in the desktop system than on mobile one.
An OS where there's only a way to install software (the AppStore) is a huge limitation and even Microsoft itself learned the mistake with Windows 10 S, offering customers to install the standard version.
Arm chips might even be faster for Apple, but MacOS X unfortunately isn't as castrated as iOS and power users will refuse to give away that (small) liberty available in the desktop system than on mobile one.
An OS where there's only a way to install software (the AppStore) is a huge limitation and even Microsoft itself learned the mistake with Windows 10 S, offering customers to install the standard version.