In bold follows a response to me by Brad Klein on the above question:
it's not a "convergence," it's a "divergence." And I think it has nothing to do with "fad" but with more substantive issues of style and basic commitments to golf architecture.
Island greens, railroad ties, double-greens, and tiered greens are fads. Links golf, using the land, or massive constructivism and "build anything anywhere" are fundamental commitments.
The arts/painterly style that Strantz uses; Engh's determination to build sharply etched dunes and trap door bunkers; Doak's sense of the ground game; Coore/Crenshaw's devotion to subtle undulation; are all basic commitments; as much as Dye's use of seduction and linear/steep vertical etching, Fazio's approach to soft, receptive flesh, or Rees Jones' longtime devotion (now being reconsidered entirely) to circular mounds and flat, horizon-line depressions.
Everyday as you my friends seek out new courses do you see modern architecture looking more and more alike or do you see the divergence that Brad outlines above..Can you expand on Brad's excellent points with other examples.