It introduces the biological "rules" Carr will later explore, such as the idea that our brains are constantly adapting to the tools we use.
By starting with a relatable personal struggle—the inability to focus—Carr creates an immediate "hook" for the audience. V. Conclusion Prologue (Shallow)
Carr highlights McLuhan’s argument that we are often so distracted by the content of a medium (the "juicy piece of meat") that we fail to notice how the medium itself (the "burglar") is changing us. It introduces the biological "rules" Carr will later