First book heading for the bin? Congratulations!

A lot of writerly talk circulates whether you're a planner or a pantser or some combination. I've explored the idea that planning needn't be the business of drawing up a map and intinerary which you will then follow: maybe it's more a voyage into the unknown, to a place which by definition you can't have a map for, for which you need other kinds of preparation. And I've thought about what I call "retrospective planning": using what are usually discussed as pre-first-draft tools later, to sort out that first or tenth draft after you've written is. But I'm beginning to...