I posted something similar in January of this year, here.
I would summarize the request to do something similar to what remnote does, as @faldor20 comments above.
- Image occlusion cards
- Concept/description cards
- Concept/property cards (similar to remnote)
- Make responses more than just text, like voice memos (this can be useful for learning pronunciation in other languages)
- Create cards using something other than the hashtag #card
- Possibility of viewing cards by topic, in a simpler way than simply using queries. For example, view the ones on a particular page. Although this probably goes hand in hand with improving the namespace/folder system, someone was already talking about it here
Anyway, I do agree that the flashcard function can and should be substantially improved, and there are good examples with Anki and Remnote as references.