Dialogue should be
natural and resemble real-life conversation
used only when narration is not acceptable

Dialogue should be:

Depending on the tone an author is trying create, the dialogue could be awkward or unrealistic. Therefore, dialogue does not have to be "natural and resemble real-life conversation".

If you are writing in third person, there would be a narrator. However, dialogue can be used when writing in third person at any time. The author may choose to include dialogue whenever they feel it is right. Also, too much narration may make the prose feel repetitive. Readers can learn a lot about characters based on how they interact with others. We can only learn about these interactions if there is dialogue.

In conclusion, dialogue is an element that can enhance writing, and it does not have to flow a certain way or replace narration.

natural and resemble real-life conversation

Explanation:

i think that the quotes in paragraph 11 contribute to the development of ideas because it provides a good reasoning of the central idea of the text.