Because finally, do not forget every time you will be actually looking for what is the CL/CD you are flying this is for the most important configuration for a designer perspective is this if from aerodynamic analysis it is said the CL/CD should be 15 for a particular efficient performance the designer will have to ensure that by displaying the wing, tail, fuselage in such a manner that indeed pilot should be able to generate CL/CD as and when required it should not happen that the airplane the way we have designed can never be able to generate CL/CD all of the order of 15.
डिज़ाइनर के नज़रिए से CL/CD बहुत जरूरी मापदंड है  । अगर एरोडायनेमिक एनालिसिस यह कहता है कि CL/CD = 15 विमान के अच्छे परफॉर्मेंस के लिए जरूरी है तो डिज़ाइनर को विंग, टेल और फ्यूसलाज को ऐसे विस्तृत करना है ताकि जब पायलट को उसकी जरूरत हो तो वो CL/CD = 15 उत्पन्न कर सके।