to plan or not to plan

I'm reading 'Originals' by Adam Grant.

A particular message that has got me thinking is that procrastination makes you more creative.
One of the examples mentioned by Adam is that the famous speech 'I have a dream' by Martin Luther King was written a few hours before the address. The truth is that the first thoughts on a topic are usually basic and conventional. If we give enough time for our mind to wander, to relate ideas, to be more flexible, we end up with a much more interesting concept.
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Let us not wallow in the valley of despair, I say to you today, my friends.
And so even though we face the difficulties of today and tomorrow, I still have a dream. It is a dream deeply rooted in the American dream.
I have a dream that one day this nation will rise up and live out the true meaning of its creed: "We hold these truths to be self-evident, that all men are created equal."
I have a dream that one day on the red hills of Georgia, the sons of former slaves and the sons of former slave owners will be able to sit down together at the table of brotherhood.
I have a dream that one day even the state of Mississippi, a state sweltering with the heat of injustice, sweltering with the heat of oppression, will be transformed into an oasis of freedom and justice.
I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character.
I have a dream today!
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This speech impresses me every time I read it... 
​And to imagine how it was back then...
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Eight years before Martin Luther King Jr.'s brilliant and famous speech, Robert Frank took the picture above, unmasking the uncomfortable truth about the american society back then. His approach seems to confirm Adam Grant's views:

"The picture, shot a few weeks before Rosa Parks refused to give up her seat on a bus in Montgomery, Ala., was unplanned. Frank was shooting a street parade when he saw the trolley passing. Spinning around, Frank raised his camera and shot just before the trolley disappeared from view."

Unplanned. I guess people who are exceptionally skilled can leave aside the 'planning' part of the process. For the rest of us... planning is crucial I would say.

​What are your thoughts on this?