> I'd bet they've spent more time optimizing MacOS for Intel at this point.
Keep in mind a lot of the core libraries on macOS and iOS have been shared since the inception of iOS. The kernel, CoreFoundation, and FoundationKit are on both platforms. There's also a bunch of other shared frameworks even before Catalyst. So much of macOS's foundational code has been running and optimized for ARM almost as long as Apple has been using Intel.
Keep in mind a lot of the core libraries on macOS and iOS have been shared since the inception of iOS. The kernel, CoreFoundation, and FoundationKit are on both platforms. There's also a bunch of other shared frameworks even before Catalyst. So much of macOS's foundational code has been running and optimized for ARM almost as long as Apple has been using Intel.