I've been reading a lot about bioelectricity and have learned that science can stimulate regeneration in animals like frogs which don't have regeneration abilities naturally (like salamanders). But the way they do it is through pain. So there are all these experiments like, cut off this frogs leg and keep the wound in a salt bath and agitate it every day and the leg will grow back.

Idk if I were the frog if I'd like this, like great my leg is back now all it took is pain and suffering instead of peace and healing. But it is an answer to this question isn't it? Why go through the pain of simulated suffering? Maybe we're trying to grow back something we've lost?