That is one reason why I'm hesitant to use LLMs to the extent that so many have. If we don't use certain skills, we lose them. I learned this the hard way with French. In my teens, I was conversant in the language thanks to years of high school French and immersion. But, I didn't touch French again until my late thirties, and I forgot most of it. It hasn't been until recently that my French has surpassed the level I was at with it in my teens.