If a hacker got the password file, which is encrypted, it could be deciphered by comparing the text string against known words that were encrypted the same way. Adding extra characters, numbers, and symbols makes it far more difficult to crack them.
You are right that a string of letters that are not words does have enhanced security, but you can’t test against that easily when someone creates a password. Adding those extra characters and symbols ensure that it will be more secure.
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