The EAV constraint came from a real frustration: I kept getting confident wrong answers from RAG pipelines and had no way to tell which parts were fabricated. I wanted something that would just say "not in your data" instead of guessing.
The biggest open question I'm wrestling with is ingestion friction — EAV is precise but you have to reshape your data first. Curious whether that feels like a dealbreaker to anyone who looks at it, or if it's acceptable given the tradeoff.