Everyone agrees setting timers in the kitchen via voice is great precisely because your hands are occupied. It's a special case. (And often used as the example of the only thing people end up consistently using their voice assistant for.)

And asking an AI where a feature is in an app -- that's exactly what I was describing. The app still has its UX though. But this is exactly the learning assistance I was describing.

And as for searching with Alexa, of course -- but that's just voice dictation instead of typing. Nothing to do with LLM's or interfaces.