Advantages of Component-Based Web Design Systems
A web designer who really gets it will help his client create a content strategy, to build a platform the client can use to add and update their own content continually, and to establish a relationship for ongoing design support. This benefits both client and designer.
Ben Hunt • Convert!: Designing Web Sites to Increase Traffic and Conversion
In our studio, once we have the key pages of the experience designed, we go back and see how we can break the design into smaller chunks so we can reuse those components over and over again across the entire experience. In other words we make the design modular.
Irene Pereyra • Universal Principles of UX: 100 Timeless Strategies to Create Positive Interactions between People and Technology (Rockport Universal)
The need for "10x" improvements on products falls away because there's so little switching cost between applications - the underlying data stays the same. Every experience can be constantly improving, with iterations coming from anyone rather than only the original creator or company. The web becomes more composable, with more builders.