Martin,
A slight essay but...
I think you and others are lumping plans and GPS/Surveying/tech etc in with bad architecture slightly mistakenly. They are valuable assets to an architect if used well, especially for the architects that aren't fortunate enough to work with the same construction crew on every job as for most it is impossible to maintain a full time crew. They also allow for accurate pricing of jobs if the initial survey/plans are close to what the final product will be. It makes the financial side of things alot easier.
In reality what I think you are getting to is how the architect creates and communicates their ideas.
If the architect can see the hole/course/green etc in their head clear enough on initial site visits and can use accurate surveys to produce precise detailed plans, perhaps including sketches and 3D models that can be passed to a shaper/finishing team who can decipher the plans well and set them out correctly then there is no reason why a good golf course/hole can't be built, partly because of this technology.........IN REALITY having an accurate survey to produce super accurate detailed plans which can be deciphered by the team on site correctly as the architect had seen in his mind without other forms of communication is unlikely to happen, it's like Chinese whispers.
Well drawn, accurate plans can be of great use to show the shapers/crew the initial ideas along with drawings/photo-shopped proposals. I'm surprised how few sketches I see. These allow the guys on site to get things close to finished without the architect having to be looking over the shoulder of every guy on site 24/7 especially when ...again... the architect hasn't had the chance to work with these specific guys before/enough to let them loose and trust them. The likelihood of originality is then more dependant to come from the next stage. A hands-on architect will then see for him/herself what it looks like in the ground and make any changes necessary as they go. Maybe a tee needs raising as the visibility isn't quite as expected or for some reason a feature just looks out of place. Some guys see things in the dirt better than when they see the initial site, others are more confident in their initial plan. Sometimes the architect is lucky enough to have someone on site who sees something they haven't that can add to the job and do some their work for them! Other times the shaper 'playing' with things on site might lead the job away from the architects vision or work against what the shaper on the other side of the site is doing if the architect isn't careful. Maybe sometimes the dictatorship is best and the architect just does everything, survey, design, shape, finish but again in reality although maybe ideal this is a really inefficient way of doing it unless the architect has 8 arms and is trained/experienced in all the processes and can win the next job to keep them eating whilst doing the current job....A 'hands off' architect may not change things in the ground in which case the shapers/finishers will likely do what they've seen before as it is close to what they expect the architect will want and thus lead to something unoriginal, but maybe they do it how they want and it becomes original because of that, or perhaps they do it exactly to the plans and the architects ideas were original in the first place.
Essentially from my experience it is all about what's in the architects head and their ability to communicate it, whether that's by plans, talking, drawings, showing is upto the architect. Whether it is original or not is down to the architects or individuals responsible for the final product, not necessarily the process.
Peter,
As for originality I think it depends on the individual. I think CS Lewis might have just been talking about his thought processes. "to do any bit of work as well as it can be done for the work's sake" is abit ambiguous to me. He was obviously blessed with an amazing imagination, where as someone else who may not have that imagination might through research and trial and error come up with something original too. The creative vs the scientific approach, the creative is probably easier but science way can still be original.
As for GCA, perhaps you could say the guys that work harder to get things 'done' are more original. Are the Tom Doaks and Bill Coores more original because they work to get every aspect done well and the originality just appears or because they have done so much research that they consciously try to produce something different, maybe in order to differentiate themselves from their competition and win work? Some of the most original GCA I've seen has been from one time architects, is that because they 'didn't know what they were doing' and therefore approached things differently to others? Maybe they tried to replicate others but were just bad?! I believe like most things in life, it's somewhere in the middle, a combination of all of the above.
Often I find originality is just what appears cool after a few efforts. Put a few different options down and the one which is coolest is often the most original, definitely rings true for me with most art forms, music, tv etc. If I try to do original from the outset with that a specific target I'd probably end up reproducing something I've seen/heard. Perhaps I associate cool with original too much?!