It is possible the reason is because Windows was not really adopted until 3.11 which was around 1992. But even then people still used DOS to load some applications and games.
Heck, even as late as Windows ME you had some kind of DOS sitting at the bottom. Only with Windows XP did consumer Windows fully evict the DOS underpinnings.
I think my first PC came with MS-DOS 6 and Windows 3.11. Barely touched Windows back then.