As I understand, a course on which it's difficult to determine a signature hole is a good thing. Cart paths should be continuous and nice concrete. "Detail applied in and around hazards" means a bunker with a 3 inch lip and as clean of edges as possible. "Lack of flaws to fairways, greens, tees, and rough" means"immaculate." "Flower beds, shrubs, rock walls, boulders, etc." are critical.
Here's the thing though. Most of us on this site care a TON about aesthetics. We have to be careful to remember that we think aesthetics are just as important as the next guy, we just think he has poor taste if he wants to see flower beds on the course. As much as he likes them, that's how much most of us hate them.
In fact, when I think about what matters most to me in a design, it's strategy, routing, playability, and aesthetics in some order, and almost exclusively. As others have mentioned, the ODGs cared a lot about aesthetics too, and there's little argument that Pine Valley, Cypress Point, and Oakmont have aesthetic qualities critical to their design, just for example.
If aesthetics have become more of a concern today, it's probably because they're more flexible. Architects can move more land and they also have more eyesores to work around, like housing developments or utility towers. It's fair to say that if you want to create a course as aesthetically pleasing as a course built in the 20s, you have to work a bit harder because there's so much more to hide now.