What is sad is many times "finished" trees (or "highly refined", or "developed", or "show worthy" trees) are purchased by people who don't realize that they will continue to need ongoing maintenance.
I've seen many JBP that were very nice at one point, but have been allowed to get leggy, their centers die out, get needle cast, and have lost ramification. They weren't repotted, or if they were, they were slip potted into a slightly larger container.
I repotted one tree, and as I did so, I found 4 layers of screen wire that used to cover holes! It had been pulled from the pot, new soil put down, and set back down, without even removing the old screening! 4 times!
I gave that tree a 1/2 bare root repot. It's much happier now!