The failures in so many other parts of the country is due to the lack of:
"same diligence"
I did not say same frequency of water. It will take as much as in a nursery pot, and a bit more, but not less.
"Diligence", not frequency.
Well branched, is not the weak unioned leftovers in the fall. There are still a few good ones, but it takes more time to march up and down the rows.
Instead of 1 in 3 being a good tree, its more like 1 in 25 in the fall.
Oregon landscape degrees include tree care and arboriculture, so the reputable landscape guys here tend to pick the better formed trees in spring and summer when the customers are contracting the larger installations before it gets mucky and slick in the rainy season.