To prevent a computer from guessing your password, longer is better. Numbers and symbols are just “extra letters” and are not that hard for a computer to guess.
Numbers, symbols, and substitutions certainly do make it harder for people to guess.
A true really strong password would be both random and long but that’s super hard for an actual person to use for their actual password (I can’t use a password manager at work) but long plaintext passwords are a good middle ground.. easier to remember/use but long enough that they’re cryptographically secure
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