>> the readability is the bottleneck not the code creation. He should improve readability.

See this is where I think LLMs can actually improve software engineering. Use them to write better code not more code. The most useful LLM at work so far is the code review bot that occasionally finds things that I missed even with a careful self review and good test coverage.

We should be prompting the LLMs to review our hand written code for security, correctness, style, maintainability, etc., and then use human review for good design and sanity checking. The bots can do things like hold all the C++ correctness rules in their context and apply them sometimes better than even a human expert.