I can only assume that a significant amount of research has gone into this by engineers around the world to determine what needs to be done for a new engine.
I know that the owner's manual states moderate varying engine speed for first few hundred miles, then go to either Schedule A or B, which is either 3000 or 6000 miles for first indicated oil change. The Corporation, who is actually liable if something breaks while under warranty does not recommend changing oil or the filter until 3000 miles!
Whereas, early oil changes are something we are all somehow aware of, since we heard it somewhere, so it is something we should do because somehow we know more than the auto companies? Not very exact!
Did you know that an oil filter was an option as recently as the 1957 Chevy smallblock V8? Standardly, the motor did not have an oil filter. Granted, that is perhaps one of the reasons that expected motor lifespan was only 100k miles for all cars of that era. IIRC, Chrysler pioneered oil filtration, and then the spin on cartridge oil filter, back when their slogan was "Excellence in Engineering"
By "exercise" there is surely a test start procedure at the GEMA engine plant in Dundee MI, followed by running it at certain rpms for a certain length of time, with a computer controlling the test cycle and all sorts of sensors checking temps on all 4 cyls, exhaust temps, ignition voltage/current, alternator output, etc. Then, it is crated and shipped to Belvidere for installation. It would be exceedingly expensive to make it, ship it, then install a motor on the assembly line, and finally stick a key in at the end, and.....nothing...........
The Megafactories shows on National Geographic channel, as well John Ratzenbergers "Made In America" and others, are educational on how stuff is made.