The only (somewhat big) downside to this, and related unix pw managers is the sheer lack of browser compatibility - mobile would also be nice, as that's one of the places where it's a PITA to use and enter long passphrases.
pass claims to have both, but doesn't:
https://github.com/jvenant/passff#readme does not work.
The iOS app has disappeared from github: https://github.com/rephorm/pass-ios#readme
It's solvable problems, I just find it a somewhat important part of a password manager.