While that's true, you have to bare in mind that the project barely made it past alpha stage and was anything but stable. So it's not really fair to compare OpenMoko to the matured interfaces we enjoy today.
Plus if you look at how long the iPhone was in development and compare that against the development time of OpenMoko, then I think you'll agree that what they achieved was impressive project given the lack of resources they had compared to businesses such as Apple and Google.
"Looked more like a replacement to early versions of Windows mobile."
Given that we're talking pre-iOS and Android, it's not really all that surprising. Back then, most smart phone OSs were pretty crap. Regardless of whether you believe that Apple innovated the mobile industry, there was a huge leap forward in OS design around then; and Openmoko pre-dates that leap.