We know that if you plant trees too close together, then they will use up all the water around their roots and compete with each other for the last drop. They'll become stressed and when they are sick, they attract insects, and when this happens we tend to spray insecticides. What we want to do, what we are actively attempting to do, is to understand these sets of relationships so that we can avoid such problems later. More wood crowded on an acre once seemed to be a good idea, but now we know that the promised returns over the long run do not always materialize. Sure, they often did, but we do not need the failures.
Management means making decisions and controlling systems to achieve desired ends.
Managers of businesses work to achieve profits. That's not all they do, because they also want safety, to be legal, to avoid labor conflict. They even paint the building knowing of the high cost of doing so, but that is what will maintain reasonable profit over the long run. It may not be necessary but the wise manager does it anyway because they understand that maintenance pays off over the long run. Ecosystem management is a phase with many meanings.