Why not both? After the collapse of civilization, as long as you can maintain the computer running, you could educate the next generation as soon as they could write. Maybe they will bypass the local agent as they learn their way into the library, to save energy.

Consider they won't have access to the plentiful practice opportunities we have now, most resources would have to be spent with a practical goal.

Both. Both is good.

A field guide to foraging for edible mushrooms will probably be more practical than naïve use of an LLM: “can I eat this mushroom?” is an exercise in trust that I will maybe never be comfortable with.

But “how do I effectively forage for edible mushrooms” is a great stepping stone.

Nvidia GPUs in the post-apocalyptic radioactive barrens are going to be stupid pricey.