The document discusses how multidisciplinary designers can maximize their impact at early-stage startups by adopting an "internal agency" approach. It recommends that designers guide startups with a set of values and principles, partnering holistically rather than as a resource. Designers should own the entire user experience end-to-end by designing everything from culture and process to products, and ensuring functions are not siloed. Adopting discovery cycles and an iterative process can help test and improve designs.