Interactive debugging is a useful tool, but it can encourage lazy reasoning. People just write something and step through until they notice some change they don't expect. That's fine and everything, but talking about "crutches" and tooling, it sounds like you may be a little biased toward big-IDE style development that makes the debugger the automatic answer v. some reasoning over the code and extra logging of potential trouble spots. There's nothing wrong with logging output v. stepping through in an interactive debugger per se.