Lettering is communication as a base level– knowing what is being said, who is saying it, and being able to read it in the correct order. Do that and the comic is "readable". Pushing beyond (I think) is reaching for story-additive work in lettering, or at least art-absorbing.
— Hassan Otsmane-Elhaou (@HassanOE) January 1, 2022
The go-to guy for examples of design in storytelling is always @HassanOE. This thread is a great visual example of how typography can support, subtract from or contribute to communication. It can do it loudly and proudly or with great subtlety. Here he is talking specifically about comics, but the message applies anywhere type is used – in a book, as a caption, posters, signs – anywhere. And there is a message that goes beyond typography, that all the details matter. Every little detail has an effect, and impacts the overall message.