Why is umami controversial?

Why is umami, the elusive fifth taste that many describe as savory or delicious, such a subject of debate? Some argue that it's simply a marketing ploy to sell more food, while others insist that it's a legitimate and distinct taste sensation. So, is umami truly a unique taste, or is it just a clever way to get us to crave more? And if it is a real taste, why has it taken so long for it to be recognized as such? What are the implications of recognizing umami as a distinct taste for the way we perceive and enjoy food? Join me as we delve into the world of umami and explore the reasons behind its controversial status.