Gokul Rajaram concept: how well a product's moat holds up through the AI transition. A product is "durable" if it has defensible data, distribution, or workflow lock-in that AI can't commoditize overnight. Most SaaS is currently getting re-scored on this axis — the honest test for FeatureOS and SupportWire is whether what's being built would survive a world where anyone can spin up an adequate clone with a weekend and a foundation model.