Interesting thought, which I think raises a few additional thoughts:
Perhaps more classic GCA than we’d like to acknowledge got it right by not screwing up great pieces of land more times than creating something amazing in its own right? I'm not sure if the Black course is the greatest example of this possibility b.c I think a lot of moving and other work was done at that site (please correct me if I'm mistaken).
For instance The Creek comes to mind b.c it seems pretty difficult to design an average or above average course on that piece of land, and with Raynorphiles potentially aghast, I’d say one of the better accomplishments at The Creek is having a wide open naturally flowing layout on a relatively narrow piece of land, especially when compared to the land that was available to Piping Rock.
Technology certainly has created more choices (which is arguably a problem in itself, especially for those fortunate to have extraordinary canvases on which to work) and I would argue that the corresponding imagination that evolves with more choices has benefited modern design in many instances. Tall Grass is one great example, the imagination clearly ruled there and it’s a very good design built on a sod farm, Whistling Straights is perhaps the ultimate in earth moving wonders of great acclaim. Even with naturally hilly terrain green sites, for instance, can be in more locations now because of irrigation technology.
In contrast, the idea of a “replica” hole, whether a Redan, Cape, Alps, Biarritz, Eden, etc., even if large amounts of earth are moved, seems unoriginal at best and accepted plagiarism at worst. Of course the genius, like the devil, is in the details and where the greatest of GCA lies and what makes a memorable course extraordinary or an acceptable Redan amazing.
I don’t know if technology has noticeably enhanced detailing . . . from what I’ve seen some of the best detailing is still done by hand, ripping out clumps of fescue grass around ragged edged bunkering comes to mind.
Perhaps someone with a much greater historical grasp of classic design could point out design examples that required great earth moving or other technological efforts for its time in an effort to understand if today’s design options are simply more efficient or new options entirely? (BTW, this is a lob ball for the Lido buffs out there.)