Adam,
Architects route the courses. Tees are place well before bunkers, but there have been a few cases in my designs where a tee was placed in relation to a great bunker site.
After that, yes we look for gentle upslopes facing the golfer to place sand bunkers where they will be visible (or holes that look like bunkers, accepting some blindness if it has other merits).
But several sand bunkers over the years have been built on flat ground by brining in fill for the backing mounds, so short version, fw sand bunkers are not limited strictly to only where landforms exist.
I rarely, if ever, put a sand bunker on a reverse slope, because its just too much fill on the back to look natural. I have seen some architects that do.
I gave some thought to "heroic carry bunkers" last night. As a decidedly average golfer, I do like them, but not if it is really "do or die." When I played Royal Melbourne years back, it was exciting to carry those angled bunkers, but I knew I was clearing them by a good bit because they were old, placed for then distances, but now very short.
As to your theory that the bunker removal reduces the game's appeal, I would love to see some study to back that up. While golfers do play courses they like, design generally ranks pretty low on most surveys, well below maintenance. And, golfers usually rate the modern courses as more attractive than older ones, so go figure.
As Pete Dye once said, the popularity of Pinehurst is that no one loses a golf ball without water hazards and with pine straw off the fairways. I guess with CC reintroducing the gunch, that might be a good comparison to see if golfers appreciate classic design that cost them strokes and golf balls. I figure the first year or so, it was full to see the changes. I wouldn't be surprised if the Faz and other courses there gained some popularity thereafter. After all, this is the facility that got rid of my favorite look - overseeded fw and dormant rough, because the customers demanded wall to wall green.