I've spent the last couple of days working on the commenting system. A few months ago, all comments would be visible. Some people asked to change this so I made them collapsed by default and you had to click a button to see the comments:
I found when this change was made, the number of comments being made plummeted. This is not what I wanted for zapread. I want lots of discussion!
- to show the top 3 comments,
- load 3 more at a time, and
- only 3 levels of nesting will be shown but can be expanded.
The number in the brackets  indicates the score of the comment you are about to expand.
I will be adding a user setting so you can change the default back to collapsed comments. This would be a post-friendly view.
Remember that comments also earn Satoshi, and I want to encourage more comments around posts. The funds from comments go to the user, community, and group. Remember that post authors do not get comment revenue (to discourage trolling).