I think this intentionality comes from the person more than the tool; like, as obvious as it is to you that chat causes people to dump a stream of consciousness while audio forces people to be "intentional" and think about what they are saying, it is frankly just as obvious to me that when people are speaking they tend to "ramble" as they attempt to somehow construct a thought on the fly (and often end up repeating things they have already said) whereas with text people construct and edit well-organized and considered statements.