You might also think you can generalize between you and I using a symmetry argument, but this is only by willful ignorance. We could learn more about each other in a way that would suggest one of us experiences certain things more intensely than the other (e.g. based on the sizes of the parts of our brains used for processing emotion, our personalities or experiences) and ignoring these differences would be the same philosophically as ignoring the differences between humans and chickens. We might learn differences that go in each direction for you and I, resulting in a moral complex cluelessness, but the same can actually happen with nonhuman animals, too: there are reasons to believe some nonhuman animals could typically experience some things more intensely than us, e.g. our better awareness of the context around an experience can reduce its intensity, and some animals have faster processing times. It’s plausible enough to me that dogs have higher highs in practice than me (although maybe I’m capable of higher highs; they just don’t happen).
You might also think you can generalize between you and I using a symmetry argument, but this is only by willful ignorance. We could learn more about each other in a way that would suggest one of us experiences certain things more intensely than the other (e.g. based on the sizes of the parts of our brains used for processing emotion, our personalities or experiences) and ignoring these differences would be the same philosophically as ignoring the differences between humans and chickens. We might learn differences that go in each direction for you and I, resulting in a moral complex cluelessness, but the same can actually happen with nonhuman animals, too: there are reasons to believe some nonhuman animals could typically experience some things more intensely than us, e.g. our better awareness of the context around an experience can reduce its intensity, and some animals have faster processing times. It’s plausible enough to me that dogs have higher highs in practice than me (although maybe I’m capable of higher highs; they just don’t happen).