It is easy to come in after the fact and say this. In reality: Had he DRYed it up from the beginning, you would probably have complained about a codebase that

It is easy to come in after the fact and say this. In reality: Had he DRYed it up from the beginning, you would probably have complained about a codebase that needs to corner cases into account deep in the code - the story had been turned around. Yes, it is annoying to get into an existing code base.