CON 🚫 It Could Break Apps
Mac apps that are made for the Intel architecture wouldn’t work on an ARM-based Mac. Because of that, most apps that you currently use would have to be updated to work. As you probably know, that could be a long and tedious transition for both developers and consumers.
More than that, Apple could actually exercise more control over apps on ARM macOS by mandating that all compatible apps be offered through the Mac App Store. While that may come with some security benefits, it’ll also mean that Mac users may lose access to many popular programs.