User experience will happen. Whether it's designed up front, or a product of users interacting with your product after the fact, the human and product will interact. Good UX happens when we make decisions in a way that understands and fulfills the needs of both our users and our business.
It's important in this definition to recognize both sides of the equation; the user and the business. UX design strives to produce positive emotions in the user, whether it's through delight or just satisfaction in getting the task performed efficiently. On the other hand, anyone working for an organization has to ensure the organization goals are met as well. Sometimes negotiating between the two stakeholders can be tricky, when the needs are in conflict.
So why do we need UX? To ensure someone is looking out for both sides equally.