“If a timberwright is good they can cut for a pretty tight seam and it will look great,” says Hyrum, “but after a few months, six months to a year, maybe two years, the timber will sometimes begin to have gaps and separations.”
This is because of the nature of wood. With the heat and cold of interment weather, wood expands and contracts. Over time, those thin posts are vulnerable to gaps and breakage. And plain and simple, it does not look as nice.