The Signed System Volume is exactly the same everywhere, on Intel and Apple Silicon Macs. It doesn't selectively install architecture-specific binaries. The "p

The Signed System Volume is exactly the same everywhere, on Intel and Apple Silicon Macs. It doesn't selectively install architecture-specific binaries. The "personalization" is basically firmware updates specific to your Mac. These are a lot bigger and more complicated on Apple silicon than on Intel. You can see this with the --downloadassets argument to the createinstallmedia tool: https://scriptingosx.com/2018/10/include-assets-in-external-macos-installer-drives/ https://scriptingosx.com/2018/10/include-assets-in-external-... The same thing happens with iOS updates.