I'm sure there is an amount of getting used to it but that doesn't explain my experience with my ACG. That I managed to get a fine tone from within days. That was four years old when I bought it earlier this year.
I was once told of a violin maker who, having finished an instrument, placed it on one of his hifi speakers for a few days. He felt that "played" the instrument in. There must be an element of that with solid bodies as well.