They hold your hand in the dialogue wheel, giving you symbols, cause apparently they think players are too stupid to follow along or too lazy to read. You expect them not to do this?
Yeah, you know what, that's BS. The most essential thing about speech, besides the actual structure of the sentence, is information about pragmatics. In actual writing in books, the information about pragmatics is included:
"Damn it!" growled Aedan, his voice thick with frustration. "I won't let you get away with this!"
In a script, where you just see something like:
Aedan: Damn it!
Aedan: I won't let you get away with this!
You'll have a lot of stage direction from the director.
But in a videogame, you won't have this information. We can take two lines from the Alistair is outs himself as a Therin conversation to show just how important pragmatics are:
#1 What?!
You don't think you might have told me this before? 
#4 Why did you wait to tell me this? 
Versus:
#1 What?!
You don't think you might have told me this before? 
#4 Why did you wait to tell me this? 
These two lines say the opposite thing based on body language and emphasis. To say that you should get this by reading a line without stage direction or qualifiers is ridiculous.