I expected the clerk to do exactly what he did. Give a mindless, almost unintelligible answer.
Some of the instruments ARE damaged. Your saying they aren't makes absolutely no difference. The shrinking and expanding of wood can cause damage to the bindings, and the finish. It could contribute to warp. It can cause glue joints to come apart. They can crack. Just because some instruments are NOT damaged doesn't make a tiny bit of difference to the fact that some instruments ARE damaged.
As for your instruments surviving for hundreds or thousands of years, a small MINORITY of instruments that are of that age are still playable and undamaged. The much larger MAJORITY of them were destroyed.
Here's Gibson's official take on this:
The most important consideration is keeping your guitar safe during the summer in very low or high humidity. Low humidity is the biggest enemy of guitars, especially acoustics. If you’re touring, be aware of the relative humidity or RH levels of the regions you’re playing. In the U.S. the Rocky Mountain area, Montana, Wyoming, Nevada and Arizona all have very low relative humidity year ’round, which, when combined with high heat, can be extremely rough on acoustic guitar tops, side and backs, and all guitar necks, causing a host of problems, but primarily cracking and warping, and, with prolonged dryness, a susceptibility to fractures.
High humidity is especially rough on solid-body guitars. States with high RH ratings in the summer, like Florida, Louisiana and Alabama — as well as, thanks to climate change, locations along the Eastern Seaboard — are the major trouble spots. Small bags of silica gel placed within guitar cases will help. But the best solution is to keep your guitars in a temperature-controlled environment, like an air conditioned home, hotel room or vehicle, as much as possible.
Too much humidity can cause the tops of solid body guitars to swell, creating high action, and can alter an instrument’s tone. If the swelling is allowed to continue unabated, the binding and glue joints can separate from the guitar’s body. Watch for any slight warping on your six-string’s surfaces. If you notice warped spots, get the guitar to a safe environment or, if swelling doesn’t cease, consult a luthier as soon as possible.
I realize you take a lot of pleasure in thinking I'm an idiot, but I most certainly am not. Martin also agrees.
Fret sprout may be common, but it is a symptom of potentially bigger problems. When you have an entire wall full of wooden instruments, and forced air heat, you are asking for trouble. DO YOU UNDERSTAND?????