The Stage is a cruel place for those who come unprepared or even less equipped. When, on the other side we don't give any 'novice' leverage to a speaker,
What makes your communication impressive? What Makes You an Impressive Communicator? What are the Credentials of Effective Communication?
Language comes before Grammar! Grammar is an attempt to describe a language. Hence, the language stands supreme and we as subordinates depend on the grammar of the language to access its virtues and mysticisms.