It follows that the skills necessary to create and sustain such a liaison can be codified and taught in bite-sized chunks. I've said precisely that in the afterword of the book. You don't seem to have much respect for psychology in the book, and you favor practical advice over theory. A man lacks a roof over his head. Beyond causing the obvious difficulties in making friends and forming romantic attachments, shyness impacts career and social mobility.
Shyness can lead to depression and despair.
It can feed into feelings of inferiority, and make it difficult to handle even the most mundane social interactions. All the same, shyness is not a disease or a defect. It is a character trait, and a perfectly acceptable one at that. Shyness is far less annoying than such mannerisms as excessive talkativeness, pettiness, or being overly fastidious. Psychologists have of late created imaginative new categories for all manners of perceived social disabilities.