Thanks for posting this. Comments are important! They are the foundation of making it engaging.
I do like how this comment system allows you to quote someone. It makes it very easy to follow along.
I don't like how some platforms post hierarchy is based on reputation. Comments need to flow as they come in.
I would like to think that we don't need to implement a reward system for comments, in either monetization or just reputation, however I am not sure if people will engage otherwise. As an example, we have a comment section on our voting and very few have used it.