@Former-MemberI love your memories of the way things were in the '70s. We didn't just know our next door neighbours, we knew the whole street. I have never been happy living in the city and if I were able I'd live in a small town tomorrow.
I lived in Kalgoorlie in the 1980's and one of the houses I lived in was numbered 8E. There was no A,B,C or D.
Rural properties are still numbered depending on the distance the property is from the beginning of the road and if there are more than one building on the same property, it will have a different number.
And in Broome where houses have numbers, there are no letterboxes because they have no posties. You have to get a PO box but the cost is subsidised. Mind you given the weather I wouldn't want to have to deliver mail in Broome either!