•Why it earns a slot
Why it earns a slot: this isn't a story about finding a teacher, it's a story that argues teachers are the wrong tool. Every stage Siddhartha masters, he abandons, because the book's real claim is that wisdom can be lived but never handed to someone else.
A Brahman's son tries asceticism, meets the actual Buddha and walks away from him too, then has to get rich, get numb, and nearly drown before he learns anything permanent.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.