Tommy,
As a generalisation, I think the backdrop plays a larger part with modern GCA's than it did with golden age and pre-golden age designers, sometimes to the detriment of the routing.
Ally,
I wonder if it's not that a backdrop plays more of a role in modern GCA than previously, but that in modern architecture the goal is to
emphasize the backdrop rather than design a tremendous golf hole with a good backdrop.
Taking an example from
Wide Open Fairways, the pictures of Firecrest CC in Tacoma circa 1929 on page 170 highlights my theory, in that the location is no different than what would be selected today if a new course were being routed on the same piece of property, but there is no way that anyone would build a green that towers like Firecrest's 17th. Most would say that it distracts from the backdrop, but the reality is it presents a hole worthy of the backdrop. The same, from what I can tell through photographs, could be told about Devil's Cauldron at Banff Springs.
I find that more of the modern courses use features to emphasize the backdrop rather than add to the golf hole. Sometimes it accomplishes both. For what it's worth, this is probably the best option on a resort course which the golfer may only visit a few times.