Correct me if I’m wrong: if something happens to your vaultwarden instance, aren’t you at risk of losing everything? I do use bitwarden, but I could never self host it. Too important. ID rather use keepass with syncthing so that more than one of my devices have my passwords

Yes. I have sensitive info in my PC (work credentials) and in the case of a break-in, last thing I want is to jeopardize my job.