Yes. I made a game for S60, in 2004. I agree the SDK and the API were poor. But I think the real mistake they made was failing to build an app store. IIRC I think they might have had some kind of rudimentary app store but it wasn't accessible to mere mortals. The only way I could figure out how to distribute my game was to post it as a freely downloadable file on the web, which I did. I have no idea whether anybody ever downloaded it. If they had just made it easy for developers to distribute their apps then I think history might have been quite different.