This question is trying to get at something else but when people talk to me about drawn-out plans my first thought takes me back to my Descriptive Geometry classes which I loved!
And those were perfect, not too perfect.
Throughout my professional path, I learned (at some cost) that perfect is the enemy of good.
Plans drawn out to the millimetre are great when they are presented. However, as things roll-out, we understand their innumerous flaws.
Thankfully, today to make plans we turn to the compass and free-hand drawing, in addition (or instead of) to the ruler and square gauge.
We are more flexible and more adaptive to changes that come as plans take place. In projects, I think it’s important to have the ability to correct the initial plan as we get to know new variables to the equation, whether regarding the value we want to deliver or the stakeholders.