This is so obvious to anyone who doesn't spend his whole life in Linuxland that is amazing to see all this drama from your detractors. In fact, I think you effectively nail this. Maemo is not taken seriously by Nokia. If it were, for example, the various applications that worked on Maemo 4 would already have been ported to Maemo 5. It looks to me that Nokia is just using people as Guinea pigs, and it figures that calling itself Open Source is a way of getting lots of Linux geeks to spend their time.

If Nokia took the N900 seriously, it would also offer tech support from people who could speak English. But that's a different topic.