@Buster29, I had to use those same rhetorical modes in my college speech class, too. I had to demonstrate how to make a peanut butter and jelly sandwich, so each step had to be clear and simple and logical. I didn't have to explain the history of peanut butter or show how bread was made.
My next speech topic wasn't a comparison and contrast, but more like a narration. I had to tell a funny story about something that happened to me when I was a child. I had to use a lot of details and also get a little more emotional.
The persuasive speech was really hard. I had to persuade people that the arts still needed to be taught in public schools. Some of my classmates argued with me about tax dollars being wasted on music programs or technical training being more practical. I had to use a combination of facts and emotions to get my point across.