It is cool that you are spreading the word of responsible ownership (lord knows more drivers need to practice this) but the misinformation in this post is unreal. Firstly, powertrains come with thousands of break-in hours tallied up at the factory. Manufacturers run their mills through countless QA sessions to ensure there are no major concerns with their engines. They also do this to ensure the engines are operating at peak efficiency and not producing excessive emissions. Same goes for the braking system on the vehicle. Your post makes it sound like the factory just bolts on the calipers, pads, and rotors, and rolls the cars out. Quite the contrary. Manufacturers put brakes through the stress test because it is a major safety concern, and the last thing a manufacturer wants is a customer performing plastic surgery with a windshield on a test drive, because the manufacture cut corners and did not quality check the most important component of the vehicle. Break in periods are a thing of the past. You paid good money for your new car ENJOY IT. No need to sacrifice your experience on some obsolete internet wives tales.

TL;DR break in periods on modern cars are a thing of the past, and arguably there is not much evidence to support this was necessary during any point of our automotive history. If you bought a new truck you can tow from day one. If you bought a new sports car, you can put it through the paces from day one. Enjoy your purchase, and practice more important "responsible ownership" like following service and maintenance intervals, and getting problems sorted out as they manifest. Not riding out a problem until your car explodes and then you ask the mechanic to be a magician and magically fix it for peanuts XD