My problem with the term “ecological balance” is that it doesn’t exist. It’s a mythical term that seems invented by Disney. Nature is brutal. Populations will get wiped out, species will disappear. That’s exactly why having a lot of species is important. But it’s hardly balanced.
I worry this view is both pedantic and harmful. Of course over geologic scales extinctions are quite normal, and nothing is static. That doesn't mean ecosystems aren't normally resilient to perturbations on a smaller timescales: https://en.wikipedia.org/wiki/Ecological_stability >Populations will get wiped out, species will disappear. There is plenty of evidence that extinction rates are extremely high right now, and…
Biodiversity is important because nature is brutal.
And it's clear to anyone who is willing to listen that humans are culpable. But that doesn't mean nature will return to an equilibrium when humans disappear.