I don't think ecologists use the word the same way you do. I'm not an ecologist; I just used to date one. But I do know that equilibrium in the ecology sense is not static at all.

If I'm understanding your comment about the rate of change, I think you're talking about drift between equilibria.

Asking about "too fast" is where the human value judgement comes in. Which isn't invalid, it is just human-centric and far from the whole picture. Stating that introducing an invasive species can destroy the existing ecosystem is a statement of fact without judgement. It is just an observation of reality.