I get what you are saying about a big tree on the green but the reality is, you are using the natural elements to your advantage. Much like hyzering into a slope to get the disc to stick in the ground. Or using a low throw with a wide rimmed driver to skip off of hard ground to gain distance or direction. Or utilizing a roller when the groundskeeper has cut the grass really short. Or like we saw at the Ledgestone last year, Ried Frescura was intentionally skipping discs off the water to get them to stick to the green on 17. I say if a part of the course can be used to gain an advantage then that's just smart play. Why penalize it?
Interesting that you cite Reid Frescura. What would have happened if his disc didn't skip and sunk in the water instead? He'd have been OB, right? So he's taking a risk skipping that disc on the water. The water is just part of the course that can be used to gain an advantage. Why penalize discs that end up in that water?
I mean, the whole point of course design is to set up obstacles that impede the player's ability to complete the hole in as few throws as possible. Some such obstacles are penalty areas. I see no reason that 2 meters up in a particular tree or set of trees can't be a penalty area the same as a body of water or a parking lot or a road. But there has to be some thought and reason behind it. Making that tree on the green subject to the 2m penalty has some thought and reason behind it. Calling everything over 2m a penalty doesn't.