Tom MacW
Which "golden age" architects were "products of links golf (and in particular St. Andrews)"? Outside of Old Tom Morris, I can't think of any who fit that description. Maybe Park and Braid and Ross met the 1st criterion (but not the 2nd), and Ross certainly spent a little time (in his early adulthood) at St. Andrews, but other than that I don't see your statement as holding any water. Certainly it doesn't apply to MacDonald, MacKenzie, Thomas, Colt, Crump, Raynor, Fowler, Flynn, Tillinghast, Maxwell, etc., does it?
As to the question, I think that architectural "emphasis on the ground game" is more of a myth than a central design principle, from my experience and observation. Not much ground game in the design of Cypress Point, for example. At most of the best courses I know, one can play the ground game, on many holes, but the aerial game is usually the weapon of choice if you are interested in a score, or in winnning a match.