I think that Iris.to threading UI can be improved a bit. For me is not always easy to pick up the main message against the referenced one. Proposal:

* Make the referenced message a bit lighter brightening up the background (now is darker that the main one, so more contrasted) and darkening the text color;

* Reduce the profile pic for the referenced message;

* Add a margin left to the main message, so it is shown "below" the referenced one;

The actual situation vs and a mockup of my proposal:

#[0] make any sense to you?