There's a difference between backgrounds and NumptyPhysics levels and application software. If you want to provide a hosting solution for the former, that's fine - it's as both an application developer and an end-user many of us object to the latter.

1) As an end-user I want to go to one place to look for software and see everything which is suitable for me (and that one place is the Application Manager, or - failing that - downloads.maemo.org)

2) As a developer, I want to announce releases of my product in one place, without having to copy & paste the same announcement to half a dozen different places.

I think that's disingenous. Sure, there are software developers who don't care about their users that much (buggy, half-Hildonised software, not put in extras(-devel) etc.), but there are others who do care about the end-user experience. Removing whatever perceived barriers are in-place to the former group requires co-ordination and discussion, though.