On the one hand you're not wrong, but this observation applies to most of life, not just art. As much as people like to think they're rational beings because of the media they consume or the knowledge they've acquired, a lot of life just happens and you justify your decisions with a reasonable sounding narrative.
But within that framework, you're really misunderstanding the purpose and value of these rules. It's not a map to get you to a specific destination like "writing the greatest novel", it's instructions to make sure that you don't run out of gas, take enough water with you and rest enough to make sure you don't crash the car on your way to wherever you're going.
Whether your novel is great, whether it resonates with people, whether you'll die and only after that people will recognize the value of your work, that comes from the sky. But to get your ass to sit on the chair and bang those keys, that does not come from the sky, anyone who has actually tried will tell you that.