Too often, presenters lose audiences by being far to “language specific” and talking in a way that sounds fantastic, but is beyond ordinary comprehension. It’s important to apply the “keep it simple, stupid” when dealing with audiences. Speaking of language level that’s appropriate to an audience is important if the message and its meaning is to get through.
Too often people “brag” about their language capacity and vernacular ability, before going ahead and losing the audience. So all is lost. And it shouldn’t be!