Try diagnosing a no-start condition on a 1983 Mercedes 300D with a laptop. You can’t. Booklet 17 offers the gospel of mechanical diagnosis: fuel pressure, timing marks, and plunger stroke. It teaches you to listen and feel the injection event.
The "Bosch Booklet 17" philosophy teaches that the engine is a breathing machine. To fix it, you must understand the inputs (Air/Fuel), the processing (ECU), and the verification (O2 Sensor). Always diagnose the of the problem (e.g., vacuum leak) rather than just replacing the symptom (e.g., rough idle).