[downerending]

Perhaps OP means "duplication of effort"?

In any case, I rather enjoy "rework" in the sense of fixing things. It's kind of fun changing a data structure and getting an important piece of software to run in minutes instead of weeks, or to add a bit of locking and get a flaky piece of software to become rock solid.

In some ways, I've become the mythical old guy that fixes things by turning a single screw. The trick, of course, is to know which one.