I feel the same way you do. Although I'm just a sample size of one, but I've had zero success in convincing any friends or relatives to use a password manager.

They either don't trust password managers, or don't want to change their current workflow.

They don't seem to care that using a password manger is probably a better solution then using the same password everywhere or writing all their passwords in a little black book.

I suspect that you and I aren't representative of typical users, and that Medium and Notion might actually be acting rationally, trying to act in accordance with the ways the majority of their users want the login experience to be.