Ever notice the size of medical reference books? There are diseases and conditions in there many doctors won't encounter in their entire career, but they need to be in there because they do exist, and a doctor had better have the information if his patient is in the .0005% of the population suffering from such a malady. In other words, Occam's Razor is a user-end responsibility. Doctors learn what in that book they can ignore until the obvious has already been ruled out. The same can be said for the FSM. It's not written as a troubleshooting or teaching guide for someone like me. It's written as a reference for mechanics who have learned (or will learn) hands-on how to order and prioritize the diagnostic information in the tome.
That said, I feel your pain. The FSM sometimes leaves me feeling like I'm reading a Chinese newspaper ... I'm not sure which end to start at, or if I'm even holding it rightside up. 
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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)
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