I think for most people, they're trading less convenience (manually dealing with passwords, and the randomly changing rules and resets different places use) for more convenience (autofill, managed & synced)

Which happens to also be more secure.

Sure, but people with PW managers are reducing their long-term inconvenience by paying a little bit up front. I don't use a PW manager for any security benefit but because it makes it easier to sign into things.

Hell, I store my 2FA keys in my pw manager and have it autofill those too -- a reduction in security! But there are some services that refuse to not spam your phone number if you don't set up some 2FA.

I keep my passwords in my head because I can't put up with managing a dozen different authentication schemes, any one of which could be compromised or lost at the worst possible time.