They detract. Speakers generally know what they want to say. I recommend small cards that snug into the palm of the hand. List KEY WORDS as prompts for what you wany to say.
CONFIDENT SPEAKERS in an informal situation can go to pieces in formal situations. They pull down a blind in their minds which says ‘ uptight time’. Make sure the blind is never pulled down.
Make sure that topics have a beginning, middle and end. PLAN for presentations to establish, build and ebb to a telling and final conclusion. Balance within discourse is a key and essential need.