The benefit of using a library directly is your 3rd party library checks will warn you when a CVE is found in the version you are using. If an LLM creates the same functionality from copying a version of a library, you might be getting a version that already has known vulnerabilities, and you probably won't be pulling in any fixes/improvements in future until you find them.
Fork the dependency and use that, to have a stable non-changing base which you use. And additionally, make the original project a dependency but don't actually use it. This way you'll get CVE information from your tooling.
If you fork a dependency and change features, the CVE information on original depenency is now no longer valid for your code. Your additions or removals can induce new CVEs, or render CVE for original lib a moot point.
