Don't Know What You've Got Till It's Done

When it comes to your writing, what is the most important element to you: plot, theme or something else?
By Catriona
What a great question. (Do the readers of this blog know that behind the scenes we Minds take turns to come up with a month's questions at a time?) Well done to whoever dreamed up this one.
For me, it's definitely not "theme". I know that for sure. I don't think I need to know if there's a theme or not, or what it might be. Sometimes I stumble over it in the course of writing but...