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I think only a percentage of production street bikes will be roll tested before ship. And not all motorcycles are driven off the assembly line in the first place. Many ship in a crate.
The mfg quality control is more concerned with finding major flaws during a production run, than he is violating engine break-in rules.
Even with the most precision of work, and the finest of bearings, there is still a small amount of parts mating that has to happen, and any eng. worth his salt knows this. So the break-in recommendation can never be removed, but rather updated to be consistant with current machining pratices, tolerences, and available materials used.