Asking "Why?" appropriately is the most powerful discovery and discernment tool in a great manager's toolkit.
This is applicable in not just a project and delivery scenario, but a people management setting as well. Sure, you can do all the investigations and find out the technical answer yourself, if you can do so, but that's not scalable, and it's not an example of leading your team.
Understanding the true reason behind a situation, issue, or decision can be challenging, but also very worthwhile. Besides the obvious reasons behind, and benefits of, simply knowing more, it also builds a deeper relationship and bond with the people you're sharing the experience with.
It's also how children learn a lot about the world in general. A simple "Why?" and "because" conversation between a young child and their parents...
