His Three Daughters is an excellent film. Death is part of life. The film will not alter this condition or try to change your mind. However, death is not the point of His Three Daughters. The journey and its impact on the characters (and its viewers) is the point, and worth every moment of viewing.
Azazel Jacobs is the writer, director, editor and producer of His Three Daughters. So it is his film in one respect. Yet from another perspective, the three female leads, Carrie Coon (Gone Girl), Natasha Lyonne (American Pie), and Elizabeth Olsen (Wind River) deliver on all fronts.
I would take the time to see a film with any of these three actresses involved. The fact that all three are involved is a delightful bonus.