"Tom
One rather large hole in your theory is that the Old Course (as we know it today) was more than 50% created in 1857 when they went from 9 holes (in and out) to 18 holes. Virtually every green going out (1-9) was created. Some of the greens coming back (e.g. 16, were significantly changed). Vast swathes of whins were ripped out, grass was planted over heather and shells, fairways widened, greens improved, bunkers laid."
Rich:
That is not part of my point at all, and I've most certainly never denied that man-made architecture had not been done previous to those "Dark Age" inland sites, particularly outside of Scotland.
The first attempts at man-made architecture clearly happened in the linksland and certainly also on TOC. And those first attempts at man-made architecture in the linksland did precede even most of the first attempts at man-made architecture outside the linksland and Scotland.
Obviously, that's why it's probably been said, and reliably so, that the first real example of man-made golf architecture may've been Alan Robertson's 17th green and Road Hole bunker at TOC. Others such as Tom Morris followed up on that in the linksland and certainly at TOC.
The point is linksland was clearly imbued with wonderful natural ground for golf generally speaking and could prosper for golf for so long without the need to manufacture things.
That was just not the case with most of the land used for golf in inland sites in England and such when golf first began to emigrate outside Scotland. Essentially most of those sites just didn't offer very much naturally for golf or for agronomy.
And when you add to that reality the fact that those first peripatetic Scottish golf professionals/golf architects generally spent so little time on those poor inland sites outside Scotland then it's not hard to figure out why those types of courses were so poor leading most in the know to call both them and their era "The Dark Ages".
But the real irony is that even with the first attempts of say an Alan Robertson's work on TOC (say the Road Hole green and Road Bunker) although they may've played great I doubt anyone would say they were a great expression of naturalism.
The same was true of another highly rudimentary man-made architectural feature that probably first appeared in this world in the Scottish linksland----ie the board sleeper supporting vertical bunkers.
That was definitely not a natural looking architectural expression or example and it's just so ironic and interesting that type of feature not only probably happened first in the otherwise wonderfully natural ground for golf in the linksland but was ALSO a man-made architectural feature that a Pete Dye picked up and used again in this country over a century later!