A good example of that is Auth0’s Cosmos design system presented by Siddharth that makes everything in their product much more consistent while also improving the developer’s happiness by providing ways of easily changing the components layout when needed.
When you’re in the early stages of design system development, consistency often works upwards. Rather than a set of guidelines dictating practice, emerging patterns dictate guidelines (sometimes to a fault). Most of us designers would love to pause and establish design principles and usage guidelines, but those efforts will almost always be trumped by production. In the meantime, you should be able to lean on key principles and methodologies that govern good UX and product design.