Why does the writer say that frankenstein is not "a mere tale of spectres or enchantment"?

In the preface of the novel "Frankenstein", Mary Shelley mentions that the story that is going to be unfold is not "mere tale of spectres or enchantment" because the story touches the aspects of human nature and conditions.

Explanation:

Frankenstein is a Gothic novel written by Mary Shelley. The story is about young scientist, Victor Frankenstein. In an unorthodox scientific experiment, Frankenstein creates a sapient creature or monster.

In her preface, Mary tells her reader that the story that she is going to tell is not about supernatural terror, because it is a story "of human passions more comprehensive and commanding".

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