Patrick Mucci.
I know of a hole that Ross designed that has a tree in a bunker--a helluva big tree at that. The 14th at Holston Hills. John Stiles or Ryan Blair might want to confirm this.
It's a downhill par three of about 190 yards. Severely sloped green from front to back, narrow entrance on the right through which a ball could run onto the green. The bunker in question guards the right side against a wilder shot and is elevated above the green. The presence of the bunker keeps raised terrain from acting as not only a sideboard but a funnel for an off line shot. And if it weren't for the tree, that bunker would be a very good place for a an accomplished sand player to be. It would allow for a mini drop shot to whereever the hole is cut.
While I'm not a forester, I am certain that tree, by its girth, has been there for more than the seventy five years the course has. And it's the bole of the tree that serves as the obstacle rather than low overhanging branches.
And while I don't have extensive experience playing Ross courses, I have played enough of them to recognize this as an anomaly. And maybe Ross had to to leave the tree for sentimental reasons (someone else's sentiment) rather than strategic ones, but it's there. And even though I was behind it, it improves this hole for the reason's cited above, but I wouldn't like it as a regular design feature. In fact, I didn't like it all as I ended up ball in pocket once due to it presence.
All that aside, I am in general agreement with you against the proliferation of trees on golf courses.
I know of a par five that once both a strategic and an heroic hole. At 500 yards it played straightaway to a raised green just beyond a creek. Two traps flanked the green and there were also trees on both sides, but the trees were at a sufficient distance to provide an ample if not generous window. The long hitter could launch a drive that would give him a reasonable shot at getting home in two. The trees framing the hole right and left were primarily an obstacle if the tee shot was off line. Of course, the second had to be precise or find a watery grave. There was great risk reward.
The short hitter could hit it anywhere in play, but he was faced with a demanding second that had to be place in a narrow alley affording the best access to the green. The shrubs that narrowed the lay up area were too short to be an issue for those going for the green in two. I thought it was a great hole, and I think most of the people who post here would agree with me in its original incarnation. But now, 30 years later, the trees have grown. The opening for the long second has shrunk to almost nothing, and the shrubs have been replaced with pines so that the shorter hitter has to lay back further and further. Also, the trees now overhang the bunkers to the right and make it difficult to get the ball into the bunker and almost impossible to get it out. This is a maintenance problem of course, but what was once a great golf hole is now reduced to a crap shoot. The trees that were once challenging soon came to inhibit strategy before they finally smothered it. Good players don't make many fours here, but they don't make many seven or eights anymore either. I wonder how many thousand golf holes have had there original design altered or destroyed by lack of maintenance or the proligate distribution of trees.
That's the problem with trees. Even those incorporated into the original design grow, and they need to be kept within limits. If green committee dug bunkers the way some of them plant trees, there are golf courses that would resemble prairie dog colonies.
And I'm not sure who it was who said that if he found a bunker surrounded by trees he would consider the bunker to be out of place. I guess it depends on which came first. If the architect intended the bunker to define the periphery of the corridor of play and trees were later planted in the corridor, which hazard is out of place.
One last randowm and barely on topic thought. Would a bunker ten feet wide and seventy feet deep be unfair? If it weren't for the problems it would bring from OSHA (Permit Required Confined Space, Excavation training, and fit tests for Self Contained Breathing Apparatuses), deepening bunkers at the same rate trees grow might be an interesting way of illustrating what many of us consider the inherent impropriety of indiscriminately planted expanding hazards. That might make a good definition of a tree if GolfClubAtlas ever develops a glossary.