I disagree. That may be the perception of someone whose palate does not have the ability to perceive subtle differences. Our senses of taste and smell do generally diminish with age.
Exactly.
Salt (sodium chloride) is a flavor enhancer, i.e., our flavor receptors perceive it as bringing out the inherent flavors in foods, though I believe the science is still uncertain of the mechanism, and salt may affect other sensations such as bitterness. Monosodium glutamate is often considered the ultimate flavor enhancer. The science is apparently complicated (my Googling reveals to me), but the one thing that seems well established is that a small amount of added salt affects our senses in ways beyond simply making the food taste saltier.
I am a salt addict, but I use it more judiciously since a hypertension diagnosis a few years ago.