LLMs are to learning what self driving cars are to transportation. They take you to the destination most of the time. But the problem is that if you use them too much your brain (your legs) undergoes metaphorical atrophy and when you are faced in the position of having to do it on your own, you are worse than you would be had you spent the time using your brain (legs). Learning is great but learning to learn is the real skilset. You don't develop that if you are always getting spoonfed.
This is one of the challenges I see with self-driving cars. Driving requires a high level of cognitive processing to handle changing conditions and potential hazards. So when you drive most of your brain is engaged. The impact self-driving cars are going to have on mental stimulation, situational awareness, and even long-term cognitive health could be bigger than we think, especially if people stop engaging in tasks that keep those parts of the brain active. That said, I love the idea of my car driving me around the city while I play video games.
Regarding LLMs, they can also stimulate thinking if used right.