Could turn sorcery points into successes on the checks or something.Classes that prepare/know more spells will be casting significantly more spells than those who only know a few. Sorcerers will be casting the fewest spells per day. So some classes have both more flexibility and more spells per day.
Effectively a ton more "high level slots", since the chance to lose them isn't much more than lower level ones. Fireballs are only 2 DC worse than Magic Missile.