Agile ways of working has us do more customer collaboration, but I just despise talking to business owners who are so stuck in their ways of thinking and working. Their opinion is that they're reached such a high level of efficiency, that learning new things and changing their way of thinking now is useless. Especially if they come from an industrial background. Often it takes a lot in me to not just explode in their face when I hear them claim how they know what's best for the product, while we developers try to advocate that we need user feedback to know what the outcome of something is.