Random is important, character set not so much. And yes when I say 2 characters I mean random ones. Even 26x26 is plenty to compensate. Or you can add one random word.
50x is not the decider between allowing a good password and allowing a bad password. It's a tiny little nudge.
Edit: To put "little nudge" another way, if you have a 1-10 scale of password quality, most steps in that scale are going to be more than 5.6 bits apart.