Here's why:
* "Phenomenal" implies something exceptional, extraordinary, or remarkable. It suggests something that stands out from the ordinary and is impressive or awe-inspiring.
* "Good" is a general term indicating something satisfactory or of a decent quality.
Examples:
* "The food was good." (This is a neutral statement, simply stating the food was acceptable.)
* "The concert was phenomenal!" (This implies the concert was exceptionally amazing and memorable.)
So, while "phenomenal" can be used to describe something positive, it's more than just "good". It carries a stronger meaning of being truly outstanding.