My take is similar.

Majority of the cases, I think this is harmless. In C#, for example, we have agents repeatedly generating switch expressions for file extensions to MIME-type.

This is harmless since there's no business logic.

But we also have some cases where phone number processing gets semi-duplicated. Here, it's a bit more nebulous since it looked like it was isolated, but still had some overlapping logic. What if we change vendors in the future and we need a different format? Have to find all the places it occurs and there's now no single entry point or specific pattern to search for.

Agents themselves may or may not find all the cases since it is using `grep` and doesn't have semantic understanding of the code. What if we ask for it to refactor and its `grep` misses some pattern?

Still uneasy, but yet to feel the pain on this one.