if you want everything --include=schema,data,statistics (presumably redundant with the default behavior) if you want schema only --include=schema if you want "everything except schema" --include=data,statistics
Until we add a fourth option, and then it becomes completely ambiguous as to whether you wanted data+statstics, or you not-wanted schema.
And if someday, for example, there is ever agreement on including role information with normal pg_dump, you add "roles" as an option to be parsed via --include without having to create any new flags.
This is pushing a burden onto our customers for a parsing convenience.
