Yes, many of the slide decks I design for clients are meant as support for a stand up presentation. But I think these cases are the minority.
What most clients are after is a different concept: the documentation of their story. The idea in their head, captured, recorded, somehow. This story can then be emailed, shared online, discussed in a 1-on-1 meeting and yes, presented live.
And when I stand back and see from which perspective I design, I think - to my surprise - that it actually is the 1-on-1 personal dialogue. When that conversation is nailed, I make the adjustments for bigger audiences.
Maybe not so strange after all though. Everything starts with a simple human conversation.