Creating flashcards from lecture slides works really good, but it could be better. Just a tip: improve the algorithm for creating the cards, and if you're still using a simpler model like GPT-3.5 for cost reasons, use a better one. If I can get better results with ChatGPT (GPT-4/4o) and Claude 3.5, there is potential.
If the automatic creation worked not just 60 to 70 percent of the time (which is still better than most services I triewd), but 98 percent, and you wouldn't have to think much about manually editing the cards, it would be a huge advantage compared to other services. And I think it's achievable. You would then be the only service where it works completely effortlessly - and these are usually the services that prevail in the end.