I’m curious what makes you believe that this distinction is precise or meaningful. What exactly is the difference?

The difference is LLMs are extremely good at analyzing code under the careful hand of an engineer. This is how most vulnerabilities are found now.

Prohibiting that might mean that security falls off.

And, if the concern is code quality, then everything before the code writing shouldn’t matter. A good engineer using an LLM for analysis and then writing a patch by-hand might create a better patch.