Parent: motivation
Sijie is the product's target user — not a marketing claim, an architectural advantage. Years of AI-conversation substance lost; LinkedIn under-represents him; friends find him hard to introduce. The founder–product fit is the bet at this stage.
It matters because the gap between building a product and using your own shows up exactly where it's hard to fake: ingestion ergonomics, retrieval shape, voice fidelity — all depend on lived friction. Sijie has that friction first-hand.