Nature doesn't respect human desires much. Some ecosystem changes are caused by natural conditions that evolve at a very slow pace. Climate change, species evolution and migration, and soil formation are examples. Others occur in an instant. Disastrous wildfires, major storms, and volcanoes do their thing, and will continue to do so.
Nature is neither easy nor particularly kind.
Forests don't always respond to gradual changes in gradual ways. A forest may tolerate a gradual shift in climatic conditions, or a change in nutrient output, with no perceptive impact on trees or other major species for many years. Cause and effect may be hard to identify. That's sometimes hard to tell. When the trees suddenly die in a forest, whether from natural disaster or human intervention, there's no guarantee that the same forest ecosystem will emerge.