That's the point--storage. They keep growing with the desire to far outpace usage needs. If they didn't, and a stress event occurred, they would not be able to sustain the life of the tree.You do know that a tree's root system is part of its resource storage system as well as an access system.
Wait just a minute--you're arguing that there is no waste? In nature? So....man's not a part of nature? I thought he climbed out of the primordial-slime, which occurred from the millions degrees Fahrenheit, which was generated by the big bang, like all the other creatures? This world's getting better & better right? Why would you stop the human race from obliterating the globe and exterminating ourselves and the planet as we know it? Surely something better & higher will come along. Do you want to stand in the way of progress? I mean, who are you to say this is as good as evolution can do?