It's because both are great for specific tasks. If I want to check that the dependency injection engine creates & disposes correctly while navigating the app,

It's because both are great for specific tasks. If I want to check that the dependency injection engine creates & disposes correctly while navigating the app, I only need printing. If I want to intercept some process and check value on the fly, or even change it, debugger is the way to go. It's kinda ironic that you're discarding the matches because you have a good lighter.