Strategy cannot be defeated by real time tactics

"Strategy cannot be defeated by real time tactics". This is a quote I retrieved from Code Geass: Lelouch of the Rebellion. People, especially adults, love to stress how important comprehensive planning is. In fact, our entire political system is designed to plan everything for the future and hope things roll out the way we want it to. However, does it always happen that way? Heck no. Earthquakes, tsunamis, epidemics, all happen without clues beforehand. We can prepare for it but we can never anticipate for it. Our preparation can barely any chance to put into actual action in effectively combating the situation. In other words, what we have done, all those set ups, have a high chance to go in vain. Moreover, those plans we think of, actually obstruct the correct way to solve the situation. Even when conditions are not met, humans tend to believe what they want to believe, and in this case, the conditions are met. They put forth their plan and wasted time and resources in it before realizing it was not worthwhile. Thus, real time tactics, or commonly referred to as improvisation, is the key to solve issues. Do not get me wrong, I do not denounce strategies and plans, but I do not agree with the current over reliance on plans.