No text is perfect. Detractors of the Samuelson/Nordhaus legacy point out that the 19th edition suffers from:
This section focuses on the behavior of individual agents: consumers, firms, and industries. Economics.19e.-.Paul.Samuelson..William.Nordhaus.pdf
The opening chapters establish the "Toolkit" of economics. It introduces the fundamental problem of scarcity and the concept of Opportunity Cost. A critical component of this section is the introduction of Supply and Demand, which Samuelson and Nordhaus identify as the essential mechanism for resource allocation in a market economy. The use of graphs and equations (such as the equation of a line for demand curves) is introduced here to quantify these relationships. No text is perfect
This is the "heart" of traditional theory. It introduces the fundamental problem of scarcity and
Transitioning to the aggregate economy, the authors analyze economic growth, inflation, and unemployment.
Among collectors and educators, the 19th edition holds a unique position.