NPK 20-20-20 FOR SOIL IMPROVEMENT - AN OVERVIEW

Is this a good idea or its Fake advice? is this akin to applying fertiliser (eg topping fertiliser) on the area with the soil?The Soil testing facilities basically Examine only for Main nutrient values with the soil like Nitrogen, for growth of leaves, Phosphorous for root growth and Potassium for Total functions of plant which can take lot of time