Spun up a Vaultwarden docker and gave it a try. You are correct, it does have password history. That's great. It was probably there the whole time and I didn't notice when I evaluated last.

I see it doesn't have history anywhere else, such as secure notes, which 1password does have.

Might still be too tough to give up the extra types and tags, but having history on the passwords is a great step. Quite tempting indeed.