This can be good or bad depending on how it’s done. If the new code addresses the same issues as the old code more succinctly, or if it can cut out some unused

This can be good or bad depending on how it’s done. If the new code addresses the same issues as the old code more succinctly, or if it can cut out some unused code that the original solution had, then it can be a net improvement. Eg refactoring an NIH solution to use new libraries that didn’t exist originally. If it’s replacing sound code with a half-thought-out implementation, maybe not so great.