I ain't so sure it is a myth. New guitars often have a lower end stiffness to them which does go away. They also develop more bloom and power over time.
From what I can gather (and I may admittedly be wrong) on new guitars fresh from the factory the finish lacquer is still somewhat soft and thicker than it will be after a couple of months of curing. The finish will actually only be 1/2 of its thickness after a year. Also glue is stilll hardening.
So not sure if opening up is the proper description but yeah, I think it is possible that a guitar's sound will noticeably change over the first year.
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"You start off playing guitars to get girls & end up talking with middle-aged men about your fingernails" - Ed Gerhard
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