Why are the main characters in The Drover's Wife & The Bush Undertaker not have specific Christian names?

Typically, when characters are not given names but are rather given "job descriptions" to explain the characters, we have what can be called universal appeal. In this case, consider that the "drover's wife" may do specific work and she may relate to her family members in specific ways. Instead of wondering why there is not a name (Sam, Susie, or Joe) figure out what the character is doing and how it relates to the other people and the action of the story. This universal appeal makes the story more understandable to all people.