I don't understand why the hell do you people crave for a narrative so strongly and why do you need to understand everything? Can't you just experience the film? It's much more rewarding, than trying do dissect it. What's the meaning of this and that? If you liked the film you know the meaning, no matter if you can't say it with words.
A film needs something linking it all together, whether that be a narrative or something else. You can to some extent just 'experience' the scenes of a film, but that means that almost every scene has to be appealing to the viewer in some way, which is unlikely for most viewers.
Also an 'appealing' scene may be cut short or not go far enough in some way, which is frustrating.