Even minor changes to existing systems can be hard to estimate if the system has accumulated technical debt over time. I agree that most software development i

Even minor changes to existing systems can be hard to estimate if the system has accumulated technical debt over time. I agree that most software development isn't very novel, but I also lost count of the number of developers scared to change parts of a codebase in fear of what it could break, even if that codebase is less than a year old.