First, even if you think you can remember all those passwords, frankly, you can't. Everyone's mind slips sometimes, and you may not log in to certain accounts but once or twice a year, making it difficult under the best circumstances.
⬛ NOT ONLY PASSWORDS BUT YOU SHOULD RECORD OTHER INFORMATIONSecond, it isn't just the passwords you need to sometimes know, but also usernames, what email address you have associated with the account, the name or web address of where to log in, or a myriad of other information.
⬛ WITHOUT ORGANIZER YOU CAN'T SHARE ACCESS TO YOUR TRUSTED ONESThird, what happens if you're incapacitated for a while? We all should have Plan B in our lives. What will happen if you die suddenly and your beloved and clozed ones can't access to your information that you want them to handle on your absence. Or how would a trusted friend or loved one be able to access the sometimes vital information within these accounts if you are unable to do so if you haven't given them some type of information to go by.