Yeah, well, I have to say I can think of no process by which a set of strings can become "accustomed" to a guitar. Strings can get a bit played in and the tone changes enough that the person playing the guitar might think they've accommodated themselves to the instrument, but that isn't how it works. Typically the strings will lose a bit of their treble response the older they get, and that's probably what Mr. Emmanuel is hearing.
whm
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