Having a design system means saving time with less errors, more consistency (vital for a pleasant user experience), and less version control problems. 
Design systems are developed to respond to customer feedback. UX data sets design standards for a foundation, assimilating design by fostering empathy for the developers. Design systems help keep UX data organized by optimizing patterns. When updates occur, communicating the updates to the design system ensures that every designer and developer knows it’s the new norm going forward.
Style guide for OSISoft

The CSS spawned a best practices document that included rules for the global CSS, helper classes and Flexbox classes. A living style guide was created to assist business consistency issues. See case study done by my company WDS

WDS Styleguide
Done in Sketch for the Waterman Design Solutions (WDS) website
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