It lets me focus on learning rather than preparing to learn which takes motivation away from actual learning for me personally. For the second part I really personally think that is a big case of AI misuse, ever since I have hooked up MCP servers and let AI do web searches and even just letting Claude use Chrome it has never hallucinated a single link ever. The specific AI model you use and your enviroinment changes a lot. You cannot expect much from a 4b model compared to a 31b model (though we are getting better at that with time). I personally used Googlr Gemini for some of my exam subjects and easily passed with high marks, did not have any of the said issues. You may want to check out NotebookLM too.

For myself though, I have found a friend who will be helping me learn a new language this summer. I will of course use his help and sources and AI to supplement my learning. I don't just tell AI to teach stuff I use it as intended, as a tool.