We just shipped adaptive follow-up questions in Four-Leaf voice interviews. It asks you "tell me about a time you led a project," you answer, and then it follows up based on what you actually said. Not a script. Not a generic "tell me more." A real follow-up like "what did you do when the timeline slipped?"
That's what real interviews do. And it's exactly the thing that trips people up because they only practiced the first answer.