Which doesn't mean you can afford to have no plan at all. Because: "Failing to plan means planning to fail".
Such words ring true to everybody who has ever had a chance to experience failure.
Proper time management is the key I would say and that's what it's good for and where it fails.
I also like that one: Proper prior planning prevents piss poor performance, the 7P.
"Plans are useless, but planning is essential."
"No Plan Survives First Contact With the Enemy"
https://quoteinvestigator.com/2021/05/04/no-plan/