I am not sure buy my guessing is that since maemo 5 the maemo developing team has been busy making the platform stable and fixing the bugs. This is because maemo 5 is pretty new and pretty suffisticated. Maybe because of this, it is harder to make maemo optified/bug free. Also, this 'team' has possibly already been merged with meego and therefore have less time for maemo. And, the meego team was probably significantly smaller than the symbian team due to the amount of devices the symbian OS covers. Finally, and I hope the last is not true, they consider this community to be somewhat self-supporting and therefore lack in the service.

I hope all are not true, just guessing from a kinda neutral point of view