The author describes the case of overlapping concurrent splices. It is a known funky corner case, yes. If we speak of editing program code, the rabbit hole is deeper as we ideally expect a valid program as a result of a merge. There was a project at JetBrains trying to solve this problem through AST-based merge. After delving into the rabbit hole much much deeper, the guys decided it is not worth it. This is what I was told.