In a conversation I had with Luthier Agostino LoPrinzi about 15 years ago in his workshop in Clearwater, Florida, he stated he could tell the personality/playing style of a guitarist that owned one of his guitars when he played the instrument at a later date: whether an aggressive player, timid, using the entire fretboard, etc. He had been building guitars, violins and ukeleles for over 40 years ,at that time, and certainly had developed a keen sense of acoustics in practicing his Art. An instrument made of wood theoretically should be effected by vibrations much as Turkish cymbals season with age and playing time. "Opening up?" Absolutely. Playing again . . . Rognvald P.S. I would use the analogy of a leather baseball glove when it is new and after it has been used for a season. They are certainly two different animals.