The Dark Knight Returns (alternatively titled Batman: The Dark Knight Returns) is a 1986 four-issue comic book miniseries starring Batman, written by Frank Miller, illustrated by Miller and Klaus Janson, and published by DC Comics. When the series was collected into a single volume later that year, the story title for the first issue was applied to the entire series. The Dark Knight Returns tells an alternative story of Bruce Wayne, who at 55 years old returns from retirement to fight crime and faces opposition from the Gotham City police force and the United States government.

Since the 1950s, when the Comics Code Authority was established, the character of Batman had drifted from his dark, violent roots. It was not until the 1970s when the character began to feature in darker stories once again; however, Batman was still commonly associated with the campy theme of the 1960s Batman TV series, and as a father figure to Robin rather than the violent vigilante he was introduced as. In the early 1980s, DC Comics promoted Batman group editor Dick Giordano to editorial director for the company. Writer-artist Frank Miller was recruited to create The Dark Knight Returns. Giordano said he worked with Miller on the story's plot, and said, "[t]he version that was finally done was about his fourth or fifth draft. The basic storyline was the same but there were a lot of detours along the way." During the creation of the series, fellow comics writer/artist John Byrne told Miller, "Robin must be a girl", and Miller complied. Miller said that the comic series' plot was inspired by Dirty Harry, specifically the 1983 film Sudden Impact, in which Dirty Harry returns to crime-fighting after a lengthy convalescence. Miller also said his own increasing age was a factor in the plot. The series employed a 16-panel grid for its pages. Each page was composed of either a combination of 16 panels, or anywhere between sixteen and one panel per page. Giordano left the project halfway through because of disagreements over production deadlines. Comics historian Les Daniels wrote that Miller's idea of ignoring deadlines was "the culmination of the quest towards artistic independence". The issues of The Dark Knight Returns were presented in packaging that included extra pages, square binding and glossy paper to highlight the watercolor paintings by colorist Lynn Varley.

Using a quote from the above article, answer the following question: What else was said about the series
Les Daniels wrote that Miller's idea of ignoring deadlines was "the culmination of the quest towards artistic independence".