This is important; there are cases of "just plain insecure" but other than that, it's very nuanced.
How about you randomly generate and write all your passwords down on a piece of paper in your wallet? For many threat models, that's far more secure than even using a password manager. For other threat models it's far less secure than using a password manager. Other than things that are just flat-out broken "more-secure" and "less-secure" don't exist without qualification.
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i think it really depends on your threat model
This is important; there are cases of "just plain insecure" but other than that, it's very nuanced.
How about you randomly generate and write all your passwords down on a piece of paper in your wallet? For many threat models, that's far more secure than even using a password manager. For other threat models it's far less secure than using a password manager. Other than things that are just flat-out broken "more-secure" and "less-secure" don't exist without qualification.