Or the ultimate undiscoverable API. It is quite similar to speech input in cars. If you don&#x27;t know what is valid to say and what not you are quite lost and will probably only use a subset of the total available API. And writing&#x2F;yelling random things against a device just to check if it will work is something that most people won&#x27;t do.<p>This applies to human users, but I think it would be similar for non-humans as well.