Legion is at least one counter-example. They used award winning indie film directors on a per-episode basis: https://en.wikipedia.org/wiki/Legion_(TV_series) h

Legion is at least one counter-example. They used award winning indie film directors on a per-episode basis: https://en.wikipedia.org/wiki/Legion_(TV_series) https://en.wikipedia.org/wiki/Legion_(TV_series) The result was that each episode often had a very distinct style, which matched well to the underlying theme of schizophrenia.