You don’t know Tavis Ormandy? https://en.m.wikipedia.org/wiki/Tavis_Ormandy
tl;dr “If you want to use an online password manager, I would recommend using the one already built into your browser. They provide the same functionality, and can sidestep these fundamental problems with extensions.”
I can only speak for myself but his article confirmed my suspicion about any Password Manager, even Bitwarden and I never have or will use any online Password Managers. I create all my Passwords individually with my own algorithm in my head and can always recreate them.
Dozens? Dude, I have over 700 passwords in my password manager ever since I started using them 15 years ago. No way I can remember them all.
I don’t know how many things I’ve registered for, but I don’t regularly use more than 10 passwords. There might be something I need to check every few years so I just reset it then.