To be clear - it's not about the scenario where NSA is already out to get me. Obviously in this case the cost of getting my fingerprints the traditional way doe

To be clear - it's not about the scenario where NSA is already out to get me. Obviously in this case the cost of getting my fingerprints the traditional way doesn't matter anymore. It's the scenario in which NSA gets interested in me because a) I made it easy for them to mass-harvest my fingerprints and b) they happen to get a false match on a terrorists' ashtray or whatever. I'm not convinced that the (hypothetically mass-harvested) material from the camera and microphone has comparable potential for such a false match.