On the flip side of the coin given optimum conditions in a container and optimum conditions in the ground I think you would get better overall vigor and production from in the ground with unrestricted root growth and more stable temperatures.
Alternately I have had vigorous plants when roots escape the bottom of a container. Perhaps a wide 20 gallon container with a bottom conducive to root escape would provide better conditions for early growth and then not produce any plant shock as the roots escape.
I have always been a skeptic of fabric containers. I prefer keeping the moisture contained. The air pruning claim seems more like a rationalization.
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