[Lazare]

You're totally right. As long as you have a different, secure password for every site and service, and you keep a careful list of all of them, and make sure to keep this list backed up, and encrypted, and sync this list across your devices so you have access to it when and where needed, then you totally don't need a password manager.

...oh wait, that's literally a password manager. Sometimes opinions are unpopular for good reasons.