I also think that having a plan is a great way to get feedback to improve the plan.
It is way easier for others to spot holes in your thinking and ways to improve if you present them with a concrete plan of record, rather than a list of possibilities. The route from a rubbish plan to a great plan is a lot shorter than from no plan to a great plan.
I agree fully with this. People find it much easier to consider a concrete thing with a framework for thinking about it than a blank sheet of paper.
I also think that having a plan is a great way to get feedback to improve the plan.
It is way easier for others to spot holes in your thinking and ways to improve if you present them with a concrete plan of record, rather than a list of possibilities. The route from a rubbish plan to a great plan is a lot shorter than from no plan to a great plan.