Earlier quoted context omitted.
> there is a valid argument that managers are not necessarily the best solution What is that argument?
"Depending on your usecase" - e.g. you use many devices, need your passwords on all of them, and don't trust any of the current password managers to do their job (which is valid due to the many breaches and vulns).
However, I agree that for some people existing password managers seem either too complicated (KeePass) or expensive (1Password). In that case, I recommend:
1. Generate a password randomly using a 'diceware' type methodology
2. Use a standard prefix in front of all your passwords.
3. Write the password without the prefix in a notebook that you carry everywhere.
It's still not as good as 1Password because the passwords are not encrypted. But it's better than using a predictable algorithm that you have to remember. And of course, it's better than the system this often replaces - using the same 8 character password everywhere.
But I still strongly recommend paying for 1Password. How much do you pay for a padlock for your bike, or a burglar alarm for your house?