It really isn't that. Writing an iPhone app is trivial compared to writing a maemo app. Cocoa is a great framework to work with anyway and the tools work with you, rather than against you. You have to really want to write software for the NITs, as it is so much harder than writing it for the iPhone. As a result, a lot of people with good ideas would just not get the chance to write for the NITs, even if they really wanted to.