I don't think they became any more distorted over time. I do find it kind of funny that people think Whitings designs were distorted while LDs were smooth. IMO their designs share similar bones. Below are Whiting's Newspaper Taxi and LD's Pendragon (athough I think perhaps the French guy recreated Pendragons lines from her sectional drawings which I have seen on the internet but never her waterlines and buttock lines so I can't vouch for their accuracy). They even have the same deck line pull in forward of the Aft Girth StationOnly Magic Bus and Seaply (Seaflyer) pleased my eye of the designs by Paul Whiting. Then he got into extreme IOR distortions. However, if this is a remain stuff of any of his yachts it is really a waste.
In any event, NT actually has a smoother run aft to her stern than Pendragon which has a bit of the Davidson crease. Overall, NT has more topside flare and the beam on NT is carried further aft while max depth is further forward relative to Pendragon.
Those differences aside, the main visual differences are that if Whiting and Davidson were both given a wooden half model of another NZ IOR design (say Farr or Young) I think Whiting would pull out a block plane to flatten any curves on the fore/aft topsides and forward bottom. On the other hand I think Davidson would pull out a ROS to round off any hint of an edge or corner. And yes, that is a simplistic view but that is how I've always viewed it.