The guy with the spruce top should have climbed higher, taking off all the limbs as he went, and cut it off maybe five or six feet from the top, with a rope attached for lowering. As to the popples, notches don't always do the trick. You might have rot in the center, or somewhere else and lose control, or you might just make the cut wrong. If you can't drop straight away from obstacles by pulling or natural lean, trim them down until it's too short to reach the obstacle. Your notch only determines general direction for certain, the tree can still drop to one side or another. Most of the time the tree will go where you want, but with expensive obstacles in the way, is it worth the risk?