> Ask an LLM to generate you 100 more lines of code, no problem you will get something. Ask the same LLM to look at 10000 lines of code and intelligently remove

> Ask an LLM to generate you 100 more lines of code, no problem you will get something. Ask the same LLM to look at 10000 lines of code and intelligently remove 100... good luck with that! These two tasks have a very different difficulty level though. It will be the same with a human coder. If you give me a new 10k sloc codebase and ask to add a method, to cover some new case I can probably do it in a hour to a day, depending on my familiarity with the language, subject matter, codebase overall state, documentation, etc. New 10k codebase and a task of removing 100 lines? That's probably at least half a week to understand how it all works (disregarding simple cases like a hundred-line comment bloc with old code), before I can make such a change safely.