1) The document discusses the distinction between user interface (UI) and user experience (UX), with UI referring to how a product is arranged and organized visually, while UX encompasses the overall interaction and experience with a product.
2) It provides examples of how the same task of buying gum can have different UIs but also different UXs based on aspects like the interaction with employees.
3) The document argues that developers need to consider UX because they are responsible for designing the overall user flow, features, and personality of a product, not just the visual interface, and that UX is important for user retention and satisfaction.