Sustainable yield forestry is a crop, basically a monoculture. Plant DF, thin, the harvest and repeat. Until you subdivide into neighborhoods.

A forest is a complex of many species of trees and undergrowth. Here on the westside there would be Red-cedar, Hemlock, and such; all of which diminish the value per acre for DF.

Because it is a crop, the trees ecosystem never develops the multi-dimensional complexity that comes with an old forest. Hence, the loss of Spotted Owls, Marbled Murrelets, and Woodland Caribou that all need the mature forest.