Great question.

Those tools evidence your code duplication (saying the lines and code regions). We, however, show you when those code regions were changed inconsistently.

We basically want to show you the effects of code duplication by introducing time whereas those tools don't have the concept of time.

If you ran those tools every single time you commit to see if you forgot to change a code region, you don't need us. If you're interested in having that ran for you, that's where we come in.

Thank you for your question. I hope to have answer it?