What is the purpose of measuring food ingredients?

Measuring ingredients is a practice that pastry chefs use because the art of Pattiserie, is an exact science, for which demands precise measurements and weights by accurate scales, pastry utensils and gadgetry that ensures such exact work.
When cooking savory food whether it's sauteed, fried, boiled, roasted, grilled, etc., there exists some hard and fast techniques like; knowing your cooking methodology, proper knowledge of what temperatures to use on all foods that can be acquired through academia or better yet, through a practical apprenticeship. Getting back to the question, it's good to understand the importance of exact weights & measurements, a good exercise to try, is to attempt making a loaf of bread following an exact, basic & accurate recipe, then make one going by your gut and what amounts of the ingredients you think should suffice. Please try this then get back to me. I'm quite curious to 'hear' from you regarding the outcome of an exact recipe and the loaf you made by what you 'felt' would work out by estimations you made yourself. Best of luck, enjoy the rest of today : )

Craig