The assumption here is feature replaces current design with the whole backup in a zip file which is split, maybe for better upload/download chances. One note on that is I think you need all the files for an unzip. Please clarify if this is not what the proposal is.
More info at:
Features (in addition to losing incremental backups efficiency, the feature would also lose deduplication)
The backup process explained (simple version)
How the backup process works (more detailed)
How the restore process works (more detailed)
Those are not checksums. Most of the random characters have no meaning except to be unique names.
SHA-256 are in local database for verification, and upload-verification-file plus DuplicatiVerify.* checks too.
I have sympathy for those who like standard file archive formats or even direct file copies. I’ve used both, however current generation backup software commonly uses formats that are optimized for backup use.
Independent restore program exists for restore without the need for Duplicati, but it has its dependencies.