EROFS, as the name suggests, is a read-only file system that Google is now planning to bring to all Android devices. Since it is a read-only file format, it will be used in only some parts of the OS.

UPDATE: It seems like Google changed its mind. EXT4 and F2FS will also be allowed, according to Mishaal Rahman. The EROFS file system format could help save storage space on Android 13 devices ...

All devices launching with Android 13 or later will have to use Huawei’s EROFS file system format for read-only partitions if they want to ship with access to Google’s services and the Play Store.

This means the System heading in the break doesn’t just include Android system files. Android 14 also uses this dangerously flawed logic for calculating storage usage.