MS-DOS did not have directories at first either. It was a feature in version 2.0, when hard drive support was added.
Directories seem to have been a foreign concept among early home computer operating systems and I suspect its adoption was driven by the adoption of hard drives. For example, the Apple II did not gain directory support until ProDOS was introduced and the Macintosh only gained folders with the introduction of HFS. I don't recall directories existing for the Commodore 64 either.
Directories just weren’t worth it on discs that stored less than 200k. You organized stuff by putting the floppies in the right place in their storage boxes.
Technically, the original Macintosh filesystem supported folders as "an illusion maintained by the system software"[1] in spite of its flat directory structure.
Directories seem to have been a foreign concept among early home computer operating systems and I suspect its adoption was driven by the adoption of hard drives. For example, the Apple II did not gain directory support until ProDOS was introduced and the Macintosh only gained folders with the introduction of HFS. I don't recall directories existing for the Commodore 64 either.