I agree with most of that. Here is what I dispute, a 48" DBH oak, 70ft tall a lead at 24" will be in the lower 1/3 to lower 1/2 especially near a house drop, which is in the lower 1/2 those proportions seem off. I was speaking generally that smaller branches are easier to manipulate that larger wood which obviously is lower down. You can always paint a picture of a situation outside a generalization. Example, no center, short wide tree many obstacles, wires everywhere. Again the example you use would be a challenge but not really what I was saying. That's why we love this work though, because things are different most every time. I do appreciate your response though because I do like those challenging ones.