LLMs do not write very "clever" code by default. Without prompting them continuously to make it more "clever", they tend to write lots and lots of simple code, vs writing "clever" code that reduces redundant code, improves performance, etc.
What I am curious about is if these slop-filled codebases will be a problem or not in the future - traditionally it's been bad practice to have duplicate code everywhere, but with LLMs it feels like it matters less, as long as the code is simple and readable.