Absolutely. A piano which just sits gets stiff if nothing else. There is even a potential for things to get stuck.Assuming that the piano is properly maintained, as your technician notes, it is much better for it to be played, and I doubt that an individual could (or should!) play a piano enough to wear it out or damage it.Fortunately, unless something actually does get stuck (which takes a technician to fix) a piano which hasn't been used a lot -- or even at all -- while it will be very stiff at first will (if it is a good piano) free up after a few hours of playing. Usually...