I agree and disagree. I do think that the purpose of legal documents is to take a given set of inputs and dictate a predictable output. But (1) sometimes ambiguity is deliberate (for instance, to kick the can on a business point and hope that it never actually manifests itself after the deal is signed) and (2) as you note, sometimes totally unexpected circumstances arise.

Wouldn’t any constructed/logical language (is that the right term?) also be susceptible to unpredictable future developments?