name one thing wrong with what I said...
Sorry about the "d-bag". that was uncalled for
I am no plant biologist but, from what I have read and the multitudes of conversations I have had with growers, gardeners, and biologist who study this plant......
Active growth of the root system occurs while the plant is actively reaching for the skies. Once the plant turns it focus on blooms, the plant slows active root growth almost completely and focuses it's energies on nutrient uptake and bloom formations. Once the blooms are complete, the plant then turns it energy and focuses on rhisome production intent on propogation.
So, by this it is "thought" that the act of cutting the plant down at harvest actually deters the propogation stage through the loss of photosynthesis and forces the plant to go into somewhat of a pre-dormancy "putting on the fat" stage. Of course, most of this is postulation but comes from people who have spent more time studying these plants than you or I combined.
So, by this I am suggesting that your statement of "Leave the bines up so that the root system can still grow even after harvest." is wrong because at that point the plant is not actively growing the root system. Rather, it is attempting to propogate itself with rhisome production.
Now, I guess the question that remains is what benifit do the rhisomes have to the main crown, if any?