How can we be designed to be in homeostasis but we're never in a true state of homeostasis? Maybe we're not designed to be in perfect homeostasis after all?
I don't think that stress is always a bad thing. Without stress, we wouldn't be able to survive. And the way our body does that is by adjusting bodily functions according to stress factors. I think our system, including the state of homeostasis, was designed to deal with stress. We don't need to fear stress, our body will take care of itself.