“The only purpose of a plan is to ensure better results, it has no value in itself. And as James wrote, we must know what to overlook, as sometimes it is better to have no plan at all.”
I value knowledge and being able to respond or adapt when it’s needed over obsessive planning of details that will be wrong the second you get to working on something. Many people are able to adapt and figure out the details for themselves — maybe not in the way you would but in a way that also works.
A broad strokes direction as “Plan” is very often useful, though, which is exactly “planning is for doing”.