Designers must prioritize Cumulative Layout Shift (CLS) as it directly impacts user experience and trust. A high CLS score reflects poorly on design and can lead to user frustration and increased bounce rates. By understanding and addressing CLS, designers can create more stable and engaging web experiences.

The article discusses the drawbacks of animating height in web design, highlighting how it can lead to layout shifts and performance issues. It emphasizes the importance of using alternatives such as opacity and transform animations to create smoother user experiences. By avoiding height animations, developers can ensure better stability and responsiveness in their web applications.