So Roboform has almost certainly thousands (of not millions) of users with weak passwords, and not only didn't they tell anyone, all they give is a shrug when asked about it. What a bunch of bozos.
Anyway the major benefit of using a password manager isn't generating difficult to guess passwords.
It's being able to generate unique passwords so when you're details end up on https://haveibeenpwned.com people can't take the password that's leaked and try it on all the other services you've used.