Plans are liabilities.

They are about talking not doing.

They make adapting harder.

When you make a plan for management to convince them you know what you're doing, you're locked into that even if it turns out to be wrong.

"How well are you executing according to the plan?

"Well we realized the plan is wrong"

"Prove to me the new plan is now correct"

A ton of work!

The over-planning that people in organizations are compelled to do is a dangerous and expensive security blanket to cover their asses and prevent meddling by their management chain.