Not really ELI5 but two main reasons. The first has to with the misconception of how of hackers actually hack accounts. Say Netflix gets hacked tomorrow and 1 million users have their login data stolen. The hacker now has a massive list where each line is someone’s email:pass, this is called a combo list. The hacker knowing people reuse logins can now use that combo list on any site or service of the hackers choosing, say Minecraft or Disney+. This is how 99% of large scale account hacking is done. Hackers use the shotgun method. If you use a different password for every single login like a manager does then this method would only get the Netflix login. Minecraft and Disney+ would be safe!
Secondly, good password managers are very secure if setup correctly. Memorizing one really good password, making sure to use it only to store all your unique logins is easier and more secure than having a few weak passwords you use for everything.
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