Board Thread:General Discussion/@comment-26159109-20160320090443/@comment-1916997-20160320135844

They are nessisary, because that is the way the show is set up. All shows have a format that they follow, it is what makes the show, the show, and while they may occationally not use the format, like Lost and Once have both had episodes where there is no flashback, straying too far for too long with make people dislike the show, because it doesn't feel like the same show anymore.