Perhaps its beside your point, but this is exactly what's most important about learning how to write. There's a whole lot more that you learn by exploring 'fuzzy concepts' and non-precise systems. Approaching natural language like a science or system is delusional at best. Reading and writing "amazingly clear and concise documents" is just one way of using language as a tool.
In a normal job, you won't use your skills only for writing official documents but also for writing numerous mails, info-files and participating in chats and online discussions during the day. How well these are written will have a huge impact on the receivers ability to figure out what you are after. More then often the things discussed are not scientific facts.