How to make great use of the General Content Principles section in your style guide

What are the practical applications for a “General Content Principles” section in a style guide? Do we add this section for largely performative reasons? Can it be leveraged in a way that provides real impact and value for a content design practice?

I recently reread Erica Jorgensen’s fantastic book Strategic Content Design: Tools and Research Techniques for Better UX, and I wanted to share some amazing and actionable ideas she offers to leverage the power of content heuristics.