Horizontal growth is about the fact base of knowledge.

Vertical growth is about how you think.

When you gain a new way of thinking, it's like learning to sense a new dimension that was invisible to you before.

We typically focus on horizontal growth, because it's easier to grow.

But LLMs are quite good at horizontal knowledge, much worse at vertical knowledge.

Now that the machines can do the horizontal so much better, maybe humans should focus more effort on vertical development?

If you want a great intro to vertical development, check out https://glazkov.com/adt-primer