I'm not refuting your claim that text or instant message content can be deep. What I want to highlight is that relying on such methods of communication when decisions with substantial consequences need to be made, or you want to get someone on board with your idea, can be treacherous. Managing romantic relationships is a widely-relatable example of this.

I bring up the business relationship aspect because HN is focused on entrepreneurship, and many of the readers are interested in the subject. Even for non-entrepreneurs, successfully managing your business relationships would likely be of interest.