> Missing lots of days means that there will be lots of cards where it's just not clear if you're going to recall them or not. ...I'm not sure how one could do

> Missing lots of days means that there will be lots of cards where it's just not clear if you're going to recall them or not. ...I'm not sure how one could do better than that. It's not clear to Anki because its model ("due" or "not due") and algorithm ("study the card that's been due the longest") are too simplistic. I know it can be done better because I built a system that does better with the same data by having a better model ("expected difficulty") with a better algorithm ("study the card which will have the highest long-term impact on difficulty").