I don't quite understand 100% what you're proposing. You mean that it would be better to be an application that opens a window with portrait/landscape mode which would act as a folder? (yes... folders are in my long-term todo list :-) Also, how would you search apps while in portrait mode? There is no portrait-mode keyboard.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...