Frank:
Even before Simpson, MacKenzie wrote that "at the great schools of golf, like St. Andrews and Hoylake, there is no defined edge of the fairway".
While Jim Urbina [and the rest of my crew] eventually figured out how to achieve that look architecturally, I think Simpson and MacKenzie were referring to ways to do it from the maintenance perspective. There are two:
(1) If you go to Royal North Devon, you'll see no mowing lines ... because the sheep and cows grazing the edges of the fairway do not chew in straight lines.
(2) Also, at places like Royal North Devon, they do what Ken Nice and crew are doing in Bandon: they don't mow a clean-up pass around the perimeter of the greens or the fairways, they just lift up the mower reels a bit before they get to the edge. As a result, the edge changes from day to day, and blurs to the point that there's really no edge at all. The look of the greens at Old Macdonald is unbelievable, it looks like the whole world is putting green.
The only people who have a problem with it are the rules guys, because it's not always clear when the ball can be marked or lifted. But, then, a lot of club members probably like the defined line, too.