But Nokia are supporting Symbian3 for now. Remember it didn't take them too long to drop Maemo support. And while that is less of a problem because the Maemo community seem to be doing a better job at keeping things fresh than Nokia ever could've done, it makes me think that as soon as the E7 is out in the wild, a few months after that, E7 (and N8) owners will be frustrated because it's likely that Nokia will drop (or reduce) support for Symbian3 as they focus their attention on Meego. And because of the nature of Symbian (and that Nokia are in charge of it now) it could become a closed OS. No tweaks, no homemade apps.
While I'm sure Symbian3 is an improvement over S60, it can't be better than Maemo5. Just take this tiny example: on the E7 desktop, you are restricted as to where your widgets and shortcuts go, in 1 of 4 squares. Sure you can choose the square, but I can do whatever I want with my widgets and shortcuts on my (4, not 3!) Maemo homescreens! Just that alone makes me wonder just how un-customizable Symbian3 is compared to Maemo5.