Of course, planning is very important.

First of all, making a plan helps clarify several questions: what is my current goal? What advantages and resources do I have now? What else can I improve and wait for? In this way, people can live a meaningful life, instead of muddling along, or waiting for others to arrange your life for you.
Second, making plans is conducive to training one's thinking ability and problem-solving ability. In the process of breaking down into small goals and formulating a road map in order to achieve the big goals, you are constantly thinking about ideas and methods to solve problems, and in the continuous reflection on the original plan, you have formulated plans for each weak link. Whether or not you follow your predetermined path in the end, your ability to solve problems can be trained, and it also gives a reference compared with reality, so as to find your own thinking blind spot, which provides a basis for the summary and reflection of the plan.
Third, by implementing the plan, you can learn to control your impulses and do things rationally.

Of course, the most taboo in planning is to be a perfectionist. The plan set for yourself is too impractical, and the variables in reality are not taken into account. If you force yourself to fail and lose your temper, it's better not to do it.