"If actions and omissions are equal, does it take equal talent/architectural ability to build a course from nothing as it does to refrain from excessive building?"
I would say yes it does---eg equal talent, although perhaps a wholly different type or form of talent. And by that I do not mean to say that some architects may not have had or do have both talents in spades.
Both types of talent, in my opinion, require a really good imagination----one to imagine what can be made, almost like the creation of mirage, out of nothing much land-wise. Examples of this would be Shadow Creek and Whistling Straits.
The other, takes perhaps an equal amount of talent to figure out how to use really well for golf land that may not be expressing itself obviously for golf, or perhaps even so well as to be thoroughly confusing. The latter might be Sand Hills---eg there was almost too many possibilities.
JC Jones:
I would take some issue with you for the way you cast this over-all question, and that is how you phrased the work and talent of the so-called "minimalist" as 'ommission'.
In my opinion, the talent of the minimalist to get the maximum really good and interesting golf out of raw ground is anything but ommission.
What it really is, in my book, is ultimately maximum recognition!