I think you misunderstood. I would much prefer somebody with skill in delivering a live spiel over a recorded narration, but I think in plenty of cases the recorded narration would be superior to a person with no such skills. Cast Members are not assigned to live spiels based on their skill but on that attraction's need for bodies. I think that system of how roles are filled helped contribute to a lower quality guide, creating the rather widespread impression that the recorded narration is superior.