With the release of Shadows of the Hist, the highest tier writs and Survey Map were tweaked to use only the highest level materials. Unfortunately, the maps were bugged and still rewarded lower tier materials. Fortunately, that issue was patched.
On the positive side, the clothing survey maps saw an upgrade with the inclusion of leather nodes in the form of trapping nodes.
Many crafters agree that there is still room for improvement. Some writs are asking for four or more items to be crafted. These writs are not worth doing as the rewards result in a net loss of materials and little to offset the cost.