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The strict rpm limit is a shortcut that people can understand and follow, and gets the job done. In reality, with more nuance, high rpm bursts are OK from the start, as long as they are short enough in duration to not build up much extra heat, from the extra friction that you still have until the engine is broken in fully and properly. Modern manufacturing has made the gentle break-in less critical, but has not eliminated the principle or the need entirely. You do what you want, and believe anything you like. I'll stick with actual engineering principles instead of half-baked internet "wisdom", and with the manufacturers' recommendations instead of some random internet mechanic.
I'm not going to argue this here any more. I've had this argument too many times, and I don't care enough if people want to abuse their own bikes. When I run across this topic, I'll generally put out the good reasoning, so people at least are exposed to the proper practice and the rationale behind it. Then it's up to you.
PhilB