I often suggest rewriting (or large-scale refactoring) to modularize big balls of mud to permit automated testing. I can always justify this by pointing out ho

I often suggest rewriting (or large-scale refactoring) to modularize big balls of mud to permit automated testing. I can always justify this by pointing out how much time is wasted doing manual testing, as well as how much time is wasted starting up a full-blown instance of an app and then navigating to where the problem is just to troubleshoot something. In my experience, though, "rewriting is wasting time" types reject that reasoning because they don't really have a good handle of software engineering concepts.