I didn't see the post as being about plans at all. Planning is vastly overrated anyway. Planning is solving the problem in your imagination, and the more steps, the less likely they are to all proceed as imagined.

Ask a car mechanic how often a repair can be completed by first planning out each thing that needs to be done, then executing the plan. My experience of doing occasional work on my car has been that it never goes exactly as described in the Haynes manual, and that's not a criticism of the manual.