Tyler,
Glad you enjoyed Holston. Thanks for sharing your photos and thoughts on the course. My comments:
1
I think the hole would be better w/o those two trees on the left, but they may actually help players by steering them away from the deep rough beyond. In the south, it's hard to get wispy "native" areas, so you're more likely to end up with a lost ball. From the tees that I normally play, the bunker is much shorter than a 200 yard carry, so the "double hazard" nature of the trees is exaggerated. Sure people hit in the bunker, but it takes a bad tee shot. I'm not sure why the trees are still there, but if leaving them was the price paid to get rid of the pines that were there, I'm happy with the compromise.
I've had a lot of bad starts on this hole. It's tough to have a long iron (at least for me) approach on the first hole, and I often end up short. The steep back to front tilt of the green makes for a difficult up and down.
2
If the tree were to fall down, I wouldn't be in favor of replacing it. The hole is architecturally better w/o it. But I don't favor removal of the tree. Sure, it's less that perfect, but for some reason Ross opted to leave it there. It was a tall tree even back in his time (tulip poplars grow slowly). A bit of quirk or uniqueness adds to memorability, and it doesn't make the hole considerably more difficult.
3
The bunkers on the inside of the slight dogleg mostly add risk to aggressive tee shots. You don't need to play near them to have a good approach angle to the green, but carrying them will shorten the hole somewhat. Longer hitters either have to club down or take on the bunkers. It's possible for a long tee shot to end up on the downslope, making a tough approach to the uphill green. This green, too, has considerable back to front slope.
4
Not really obvious, but the front right of the green slopes down toward the bank, and the bank is pretty steep towards the water. The tee shot is at a bit of an angle, and the bunker on the left nudges you to favor the right. It's easily possible for a tee shot that's pushed and only a little short of the green to run into the water.