There are 203 passwords in my password manager
Most of them unique, and many of them used maybe a couple of times a year.
No rules for password complexity, passphrases, or other similar solutions come close to dealing with the problem that I have to remember 203 of them, and I have to remember which memorable phrase was used for which site or account login. It ain't going to happen.
One of my banks supplies a dongle for two-factor authentication, and a few sites offer my phone as a second factor. But carrying round a keychain full of dongles is not going to happen either.
There is simply no alternative to a password manager.