Here is a trident just removed from the Anderson tray. The roots are raked, pruned and washed to get to this next picture.
A bit more pruning.
It's difficult to appreciate in the "looking down" views how much root pruning is done underneath. Here is the root ball from below. You can see where large roots were pruned. And, you can begin to realize the potential for fantastic nebari with a few more years of development.