People are definitely surprised when they blunder mate in one. But after it happens and the pieces are knocked to the floor, perhaps seeing what you did wrong and understanding it quickly is a feature of the game rather than a bug. This allows faster learning cycles, a feeling of mastery, and progress towards the 2000+ level. Don't forget the competitive dynamic too. Can you learn faster and do better over time than your opponents? This is motivating to many. I certainly enjoyed improving rapidly vs my peers in high school.
I would add that, having now reached 2000+ myself years ago, the same punishing tactical dynamics apply at master level and it's harder to continuously make progress. At some point all chess players turn to other activities, often ones that are more creative, because chess does become repetitive in the confines of the 64 squares. Of course, it's still near-infinitely variable, but the contours of games and the player's progress within them are somehow bounded. Within the last year, I've made a serious effort to switch to Go.
Chess really isn't for everyone always, and as AlphaZero shows, it may not be for any one either... us mere mortals will struggle along, occasionally indulging in puzzle brain crack, and sometimes making meaning out of the journey. In the right context, it can be enjoyable too.
The conclusion of the book states that rather than being viewed as unilaterally boring, I hope chess can be respected and appreciated by all, just like chocolate. You don't have to personally like chocolate, but that doesn't mean it's intrinsically bad, and many people do like it :)