Just predicting the future and letting it run its course is not planning. Planning is when you take identify steps that you can take now to shape the future and change it for the better. You do not tax plan just by predicting how much money you will have to pay at the end of the year. You plan by deciding what you can do now to lower that future bill. Then seeing it through.
The same is true for business planning and estate planning. You are going to die. Your stuff will be passed to someone else. Planning just to transfer the assets is not a plan. A plan will help you do things with those assets to make sure they take care of your family when you are gone.