> If anything, password managers help me see which accounts I should be deleting.

I think this is a hint towards what, IMO, password managers should be moving towards. I would like a password manager to really be an account manager that can do things like:

* Alert me if a site I have an account on has a publicly declared breach

* Let me manage personal details (such as associated email address, phone number, etc.) all in one place

* Tell me how often I use each account (and when I login to them from 'unusual' locations/computers)

etc.