text: The Scottish side of the borders has been mapped in a 'unique' style by a very active invidivual.
  There's a lot of rather excellent detail, but have to agree that the use of area=yes on highway=* is somewhat eccentric, and suspect some routing engines may not support areas at junctions rather than ways with points.
  On the Northuimberland side I've been checking junctions have clear point intersections, and also reducing the use of highway=tertiary.
  Farmyards often have rather complex polygons which, oddly enough confuse JOSM validation - not a definitive reason alone to change, but...