There’s really nothing that can substitute for the certainty of actually watching someone struggle to use your design, but these analytical approaches are quick ways to get feedback, and suitable fallbacks if working with actual people isn’t feasible.
This quote underscores a key limitation of analytical evaluation methods—they rely on expert judgment and design principles rather than direct user interaction. While heuristic evaluations and cognitive walkthroughs can identify potential usability issues, they can't fully capture the complexities of real user behavior. It made me think about how designers must balance efficiency with accuracy when evaluating their work. While analytical methods can be useful early in the design process, they shouldn’t replace real-world testing with users, especially when designing for diverse audiences.