"Don't judge a book by its cover." is a bad idiom, because bookcovers are desinged to represent the content of the book.
"Don't judge a book by its cover." is a bad idiom, because bookcovers are desinged to represent the content of the book.
I think the point is that the cover is never guaranteed to accurately represent the book.
Quality of cover =/= quality of book
Although, I’ll never buy a book where the author’s name is in bigger, bolder font than the title of the book.
I hate that trend in cover design and I refuse to support it.