Varda's alienation of the audience

A few weeks ago in French Non-Fiction film class I saw one of Agnes Varda's films, L'Opera Mouffe which mirrored this film in many ways. In Mouffe, Varda is much more poetic and this film fits less so in the documentary genre then Gleaning. However, as confusing at times as both films seemed to be, it is apparent that Varda has a deep interest in (H)umanity. Her films are enjoyable and interesting but they still fail to address a larger theme or goal. It's either that I cannot pinpoint what Varde is trying to achieve as a filmmaker or maybe she is just making art, developing a technique without a mission or a focus. It seems as though her projects and films aren't whole to me--they definitely have a technique but they lack something at the same time. Or perhaps she does this on purpose--leaves her films so open to interpretation that its her goal for the viewer to "complete" the film themselves through their own interpretation. I feel like Varda can get away with this because she focuses on Humanity, a subject everyone is familiar with but what happens when other artists start to leave their work so open to interpretation that they start to alienate their audience?