It is all about the casting. You would not want to take the risk of starting the shooting with a person you did not meet at the audition first.
When audiences hear that the film has no dialogue, some are scared, they think the film is completely abstract, essayistic, a constrained artistic film, but no, I love drama! I like to use the rule that Thomas Vinterberg spoke of - to put your hero in the worst possible situation at the beginning, and from that ...