I feel like I recall a story about a chip company that slowly reduced their salt content by like 50% over a number of years and literally no one noticed or complained.
I definitely saw another story about how they were researching pyramid-shaped salt crystals because they have higher surface area to volume, and with cuboid salt you wind up swallowing it before the whole thing even dissolves, so you’re not even getting a theoretical flavor experience, it’s just going straight into your gut.