This is one of those very rare cases with potentially huge negative effect to make it into a mandatory feature.
> Dumb file storage
Which still suffers from inefficient incremental updates. Curious whether those other managers deal with that (do they split your vault into parts)?
> What kind of documents would I put in a password file?
Whatever documents you want to securely share with others, various scanned docs, so it's not just a few megs, (e.g., Bitwarden offers up to 1G encrypted file attachments) (though don't use this either, mine is just a few megs)