Pffft, if you can have 4 to 6 apps running (background) in multitasking, that should be enough !
However, the N900 had an even better solution. The apps were working (multitasking) in real-time (icons). What I do not like is that the N9 (like the iPhony) stop apps when not in use.

What I mean is that my N900 still can show max ~32 apps, and more reasonable 4 apps, live, e.g. youtube clips running.

Look if I want to stop an app running I can click the stop/pause button ! Or not ?