The article emphasizes that animation in UX is now a standard rather than a novelty. It serves key functions: showing interactions between screens, explaining how to use an application, and directing user attention. The author notes that while animation is more art than science, experimentation and user testing are essential. The guide aims to consolidate all major principles and rules for interface animation in one place, making it easier for designers to find practical advice without searching multiple sources. The core message is that animation should be purposeful, enhancing usability and user experience rather than just adding visual flair.