The initial problem was incompetence and poor planning, but after that, esp. once the DNC got involved, I think the delays in the release of results past the first 24 hours after the caucuses were more about sinister stuff, like the party wanting to control the narrative of who won and got the media bounce from it. At that point, I think it became about releasing the results selectively to show only the precincts they wanted to that would give them the winner they wanted, Mayor Pete, rather than Bernie... Fortunately, they couldn't prevent the news getting out clearly that Biden did really poorly...