Isn't that too much work?

Instead, just learning concepts with AI and then using HI (Human Intelligence) & AI to solve the problem at hand—by going through code line by line and writing tests - is a better approach productivity-, correctness-, efficiency-, and skill-wise.

I can only think of LLMs as fast typists with some domain knowledge.

Like typists of government/legal documents who know how to format documents but cannot practice law. Likewise, LLMs are code typists who can write good/decent/bad code but cannot practice software engineering - we need, and will need, a human for that.