I think it stems from the law validating that view. Courts don’t care if 999 in 1,000 didn’t understand you, they’ll enforce whatever was written. That makes it beneficial to not be understood, because you can basically get courts to enforce terms that you unilaterally dictate. So contracts and laws devolve into a contest of unintelligibility, limited only by ability to prove to a court that you did say the thing: slipping in surprising and unrelated clauses, misleading headings and names, different vocabulary from common English, etc. Contrast that to warning signs and to communication between teammates, which have evolved a totally different communication style, because in those cases it’s actually detrimental to be misunderstood.