People regard flashcards as something trivial from their school days, so they don’t take writing them very seriously. But it’s awfully hard to write good prompts for a Spaced repetition memory system. For example, good prompts:
Unfortunately, it’s not obvious when the prompts you’ve written are bad, so people often don’t realize that their prompts are bad. This can cause them to underrate the performance or overrate the tedium of spaced repetition memory practice. More: To what extent do review sessions offer prompt-writing feedback?
Even if one develops the skill to write good prompts, it’s quite time-consuming and cognitively taxing to do it. I believe that this is another significant barrier to widespread adoption.
Matuschak, A., & Nielsen, M. (2019, October). How can we develop transformative tools for thought? https://numinous.productions/ttft
Nielsen, M. (2018). Augmenting Long-term Memory. http://augmentingcognition.com/ltm.html
NIelsen, M. (2019, January). Using spaced repetition systems to see through a piece of mathematics. http://cognitivemedium.com/srs-mathematics