[ralmeida]

Yes, is is designed for storing QA pairs, but it doesn't mean it can't be used for anything else.

I believe you misunderstood the use I have in mind for the WHY questions. The idea is not to create cards for things you are trying to understand, but for things you already understood.

These things you describe are about learning. Flash cards/Spaced Repetition Systems come AFTER learning. Say, for example, you meet an expert and because of that have a great insight about issue X. Truly, real "insights" take longer to forget than rote memorized facts. But can you say you will remember this insight in 6 months if you don't serendipitously encounter it again? 1 year? 5 years?

That's where a reviewing system comes into place. And it's not because such a system is designed for things that mostly need to be rote memorized that you can't use the "question" as a trigger to revisit something of a different nature.

[lispylol]

> But can you say you will remember this insight in 6 months if you don't serendipitously encounter it again? 1 year? 5 years?

Good point. I think I misunderstood your intention behind asking why questions.