I wish you a happy new year too, mate.
I don't really think there are any practical reasons why the tower was built the way it was. But I don't really know ;-)
One of the reasons why the castle is so well preserved is because it is in the middle of the forest. Far away from larger towns. That's why it wasn't a target for bombing raids during the Second World War.
Sometimes it's good to live far away from the action.... ;-)