That's a very waterfall way of looking at it. "Business have requirements, we have software, if we just understand the requirements we can build the perfect sys

That's a very waterfall way of looking at it. "Business have requirements, we have software, if we just understand the requirements we can build the perfect system". I could hardly disagree less. Software is deliberate, yes. You need to know what you want to do at a pretty detailed level, but that's not the challenge. The challenge is that this new technology (what software can do) is a gamechanger for most traditional businesses. It creates a lot of new opportunities by enabling ventures you couldn't even imagine before, and every time you build more, you get more opportunities. Software requires you to reevaluate what you were doing previously. That's hard. Software is also fluid. As you get more software, you see more opportunities. As you get more, you want more. Anything that tries to treat the domain as "static and understandable" is doomed to fail. Development is not the steady march towards the perfect system. Development is the discovery of what you can do with software, and how that changes the business processes that already exist.