Because "sterile" exotics often have a seed production rate at >0% in the best scenarios.
Why introduce an invasive species into the environment when there are plenty of natives that will do the trick?
Stop being so lax with noxious weed contamination risks.
Treevan has my respect. He's got a lot for experience/knowledge on reclamation and permaculture.
That said, we come at things from two very different view points. I work exclusively with natural systems and minimal inputs/mgt as we are going in, establishing veg, and walking away.
He has more of an agro/forestry/intensive mgt perspective which can work, but I'm just not used to thinking like that.