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Most high end anything mechanical, cars, boats, CNC machining centers all have break in periods and even at every use you are instructed to run the machine at low speeds and/or loads until the machine comes up to temperature. The internals are so tightly fitted that the thermal expansion of the materials is required to get the intended fit in the design. A tightly fitted firearm needs enough cycles for mating surfaces to "wear in".
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As I argued in an earlier post, break-in periods suggested for automobiles and other similar mechanical devices that have "tightly fitted" parts are recommended (though some newer vehicles come with no break-in regimens) in the interest of optimum
longevity, not to make them
eventually operate as they should. No one I know of would tolerate driving a brand new car for x number of miles before it ran as it should. The same minimum standard should apply to any new firearm "out of the box", imo.