Resources isn't the whole story, and IMHO lack of / constantly shifting focus seems to have been a more significant factor since Diablo.

By which I mean the whole killing Elephanta, Internet tablet -> phone, Hildon -> Qt, Maemo -> MeeGo (and who knows what's coming next) business. That's basically 5+ years of development down the drain by the time Harmattan arrives, and I can't seriously believe any of these were in the roadmap when the N810 came out.

All this after Nokia had demonstrated to the competition that you can build a decent *nix handheld, and then left them alone to build up their own platforms for a couple of years. Clever, that.