At the same time, the LLM will, with some reliability, ignore the patterns or best practices in your code, or implement the same thing twice in different ways.

There are certain things they do, or don't do, that a human typically wouldn't, putting absolutes and anecdotes aside

Humans, with reliability, will ignore the patterns or best practices in your code and implement the same thing twice in different ways.

In 25 years I've never worked in a codebase where this wasn't true.