While I recognize that this only one example of what you can do, you can just ask chatgpt to program you a traditional program that does something like this and not have to run a (pretty big/power-intensive/slow on most hardware) 3B/7B parameter model for simple tasks like these.

Yeah it wouldn't be as flexible as a LLM (for example synonyms won't work), but I doubt that for this particular task it'll be that big of problem, and you can ask it to tweak the program in various ways (for example introducing crude spaced-repetition) making it arguably better than the AI solution which takes sometime to prompt engineer and will never be "perfect".

I don't really know how much better fine-tuning makes these models, so I can't think of anything that they can actually be used for where they aren't worse than traditional programs, maybe as an AI in games? for example making them role-play as a historical figure in Civilization 6.