Good thread Mark, although I think your Appelation Controllee model doesn't really have legs (as it were), as it focuses on the land/terroir and not who designed or planted or even looked after the vineyards. If a new owner decides to plant more or less Malbec and replace it with Merlot is that a serious "design" decision, or just business?
As for GCA, as you and I know well many of the older courses, particularly in the UK, have more fathers than some families. Even if we can identify the various DNA samples, how do we attribute patgernity to a course like Dorooch, for example?
1--Ross (1921)
2--Sutherland (1921)
3--Morris (1877)--tee revised by Steel(?) c. 1985
4--Morris (1887)
5--Morris (1887)
6, 7, 8, 9, 10--Duncan/Grant/McCulloch (1946)
11--D/G/M (1946--tee and fairway only), Morris (1877, green)
12--Morris (1887)--green moved by Sutherland/Taylor (1904)
13--in and out and in of routing from 1887 to 1946
14--Morris (1887)
15--Morris (1887)
16--Morris (1887)
17--Taylor/Sutherland (1904)
18--Morris/Taylor/Sutherland (1887 and 1904)
NB--these are all guesstimates based on the facts I know and have inferred
As for the routing, Old Tom Morris did much of the bare bones (clockwise, mostly stick to holes played along the 3 levels which separate the land from the sea, greens on plateaux), but Sutherland, Taylor, Ross and most importantly "D/G/M" made fundamental changes, over a 40-50 year period.
So, is Dornoch a "Morris" course? In many ways, yes, but in many other significant ways, no.
Multiple attribution problems arise at most of the great GBI links--County Down, Portrush, Lahinch, Portmarnock, Ballyliffin, Waterville, Ballybunion, The Old Course, Carnoustie, Prestwick, North Berwick, Aberdeen, Cruden Bay, Troon, Hoylake, Ganton and Turnberry, just for a few more notable examples.
There are far fewer examples of such multiple parentage in the modern age (or even the first "Golden Age"), at least for courses that still have a lofty reputation. Why?
Well just maybe it is because 100+ years ago, golf courses were not treated as shrines to creativity and/or craftsmanship, but as venues for playing a game. If the game on a particular venue could be made more interesting or challenging, why not make the change? The real question is do you want to play over a musuem or on a venue which inspires and maintains your interest and pleasure? The obvious answer is "both!" I think this is the general philosphy of club in GBI, and the enduring quality of their courses argues strongly for the "both" options, even if it means overwriting some golfing history.
IMHO.