Robert King also revealed his philosophy on finales, with respect to whether those episodes should tie up all loose ends or be more open-ended.
“I don’t think the best finales have wrapped up all the loose ends. They’re novelistic and novels have a lot of ambiguity. You want a last episode that resonates. When you get to the last show and you want to start over at the beginning, all 156 episodes, that’s the triumph of a finale,” Robert King said, citing the finales of Six Feet Under, Breaking Bad and even the controversial Sopranos ending as episodes that all meet that criteria.
Source and more: THR