It doesn't pass the straight face test... if someone tells you they missed the shot because they didn't give the shaft time to break in, you've gotta laugh in their face.
That is damn funny... but quite true.
The guitar stuff is OT but interesting. Notes are simply vibrations per second. An A is 440 vibrations per second (or 220, 880, and so on). This is easily measured. Probably as wood becomes more dry and brittle, or the finish hardens, it DOES affect how rapidly the whole thing vibrates and echoes your plucked string. But you'd simply tweak your tuning until the strings vibrate at the right frequency.
There are other subtle things like the 'attack' and so on, but I'd think that has much more to do with the strings generating the sound than the hollow wooden box amplifying them. A lot of musical terms are fuzzy and hard to measure scientifically. What's "tight" or "more balanced" mean? Or "warm"? Probably some of this is more the indian than the arrow, just like in pool.
Very good questions that, unfortunately, lie outside the scope of a pool forum.
Yes, it is very much the Indian. I've been playing acoustic blues at a high level for over 40 years (Jeez, I sound like English now), and I can say for sure that most of my tone is in my fingers. There is a saying about violin playing, "A great player carries his tone with him". That means that, Stradivaris and Guarneris aside, the violinist can bring forth his basic sound on any well-made and set up box.
However, does that mean that Joshua Bell would just as soon play on an exact copy of his Stradivarius as he would on the real one, or that the audience gets no benefit from him playing on the ancient masterpiece? There IS a difference, and top players pay millions to have this small advantage in tonal flexibility and beauty.
All I know is that this old Indian has fixed thousands of guitars, basses, mandolins, violins, cellos. I have had hundreds of old Martins in my hands, and have dozens of them apart on my bench for repair and restoration. I play well enough to know the difference, and I prefer the old ones to the new ones 10 to 1. There are plenty of guys out there making Martin clones, some of the them are using wood that actually came from the Martin factory decades ago, so it's plenty seasoned. They do everything in their power to duplicate the old measurements, glues, finishes, methods, etc. They sound great, but they don't yet have that fat old sound that players love so much.
I can't quantify the changes that occur, but they are very apparent when you have an old guitar in your hands, at least if you can play well enough. It's all FM. A F*cking Mystery.