This might be true but also it’s also a much lower commitment work to direct a 45 min episode or two than a full movie or series. Having ‘auteur’ directors do a handful of tv episodes is a great way to book excellent film directors without having to deal with scheduling difficulties that come with shooting a whole movie. According to Rian Johnson the delays on the films that they offered him are all because he’s already booked solid on other projects for the next 3-5 years.