Because they provide a way to have hundreds of unique secure passwords. There is noway you remember all of them in your head. And the way the vast majority of hacks work is not that a hacker takes over your local pc and waits for you to put in your password into your password manager. Its either they hack a company and try the password email combination from that side on other websites this is prevented by a password manager by having unique passwords or hackers get you to put in your password on a scam site and use that password then again on other websites.
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