For expand/collapse, one of the very few things I've liked about "new" Reddit is being able to click the indent bar alongside comments to show/collapse. Something like that in this for HN would be helpful.
The “click on the indent bar to show/collapse” on reddit was something unintuitive for me initially. Moving from desktop where there is a clear arrow icon for that, I searched online on how to do this in the interface without the triangles. :)
