This is the most quoted section of the PDF. Reis warns against "over-engineering." He posits that most data pipelines fail not because they are technically wrong, but because they are too complex.
Before this book, “data engineering” was vague. The authors give a concrete definition: the development, implementation, and maintenance of systems and processes that take raw data and produce high-quality, consistent information for downstream use. Fundamentals of Data Engineering by Joe Reis PDF