Hi, I'm daperl, an actual Maemo 5, Maemo 4, former iOS and just-starting Harmattan developer. You're spreading FUD. Please don't.
Open isn't binary (that's kinda geek funny), it's a spectrum. You can't talk about the "openness" or "closedness" of Diablo/Fremantle/Harmattan and iOS in the same sentence and still be credible.
When us developers and hackers finish going through the APIs, we'll let you know how open or closed Harmattan is. Thanks.