Spaced repetition is almost designed to be difficult.
The method works best when you are presented with questions that are at the limit of of your abilities. If you see a lot of cards that are easy to answer you are probably wasting a lot of time. Therefore, when it works well you are seeing a lot of cards that are hard for you to answer. I think that feels bad for a lot of people because only being presented with the hard cards makes it seem like they aren’t good or improving at the thing.
Spaced repetition is almost designed to be difficult. The method works best when you are presented with questions that are at the limit of of your abilities. If you see a lot of cards that are easy to answer you are probably wasting a lot of time. Therefore, when it works well you are seeing a lot of cards that are hard for you to answer. I think that feels bad for a lot of people because only being presented with the hard cards makes it seem like they aren’t good or improving at the thing.