That's why they put it there. A wise farmer, before he begins farming, he tests the soil. If you had a brand new garden you must test the soil because you don't know what that soil is like. So you run it through tests. You don't want any surprises.
Farmers get a lot better quality and quantity as they test the soil.
They can increase the productivity. They know what crops can be planted on that ground and do its best in that place. He doesn't want any surprises. Soil samples help a farmers knowledge of the nutrient status of the soil in his field. He can increase soil productivity.