Why does the communication method matter?

Live presentations give you little control but also mean you need highly detailed slides.

Live presentations give you a lot of control and you don't need a lot of detail.

A written document gives you a high amount of so you don't need high levels of detail in your documentation.

The slideument is the crowning achievement for giving presentations allowing the presenter to have all the information needed and the presentees to have all the information they may need later.