Here's why:
* Meaning: Savory means "having a salty or piquant taste." It's a quality, not a quantity.
* Usage: We don't say "more savory" or "most savory" to describe a taste.
To express varying degrees of saltiness or piquantness, you would use other words:
* More salty: "The soup is saltier than I expected."
* Most salty: "This is the saltiest food I've ever tasted."
* More pungent: "The cheese has a more pungent flavor this time."
* Most pungent: "That spice is the most pungent in the market."
Let me know if you have any other questions about words or grammar!