Some people say that specifications are useless. That they never reflect the reality, that by the time of being done they are out-dated and people should just rush out, start coding and start working. I found this nice quote:

In preparing for battle I have always found that plans are useless, but planning is indispensable.
--Dwight D. Eisenhower

That was my missing piece to the argumentation. May be the specs at the end are "not so accurate", but at the time of writing them, the idea has to be exercised, questioned, the missing gaps filled in, all details understood and the goal clearly defined.

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