> With ai it’s cheap and fast for a professional to ask the AI: what does this rubbish software do, and can you create me a more robust version following these guidelines.

This falls apart today with sufficiently complex software and also seems to require source availability (or perfect specifications).

One of the things I keep an eye out for in terms of "have LLMs actually cracked large-product complexity yet" (vs human-overseen patches or greenfield demos) is exactly that sort of re-implementation-and-improvement you talk about. Like a greenfield Photoshop substitute.