Well, if people are finding him relatable, I think that would tend to indicate they got something right. Everyone's experience of depression is different. (I do think I recognized a lot of the absolutely wild depression-philosophy he was getting into in Ktisis Hyperboreia - I recognize that it's completely nuts, but it felt very similar to some of the rabbit holes I've gone into.) He does seem to be the only person who reacts as strongly as he does to the "necessity" of putting down animals that aren't meeting their performance metrics. Other people were experiencing grief, but was anyone else driven to the same level of despair over insufficiently successful animals? I don't think so. Emet has the whole monologue about how the Sundered are so worthless compared to him that our deaths are morally meaningless, and we can talk and express feelings - I really don't see any of the Ancients feeling more strongly than that about literal animals.