yes...you want root bound when you transplant.
.unless you do 'modular'...inserting a small softee into a larger pot of soil with the smaller fitted into it.
Ok now this confused me a bit, I was always under the impression you wanted to have the plants roots to reach the outer edge of the pot and begin to wrap around the container, then transplant right before the plant can become root bound. What did I miss? I know I missed a bunch because of life and work, was there a class on roots I missed?