This section serves as a "safety net," reminding the designer that not every problem requires a noisy, complex switching solution.
If you need an overview of the book’s contents (e.g., SMPS topologies, feedback loop design, magnetic components), I can write that for you.
For engineers, hobbyists, and students alike, this text has become the gold standard for bridging the gap between abstract circuit theory and real-world, manufacturable power converters.